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View Full Version : 2006 Chev 3/4 ton 6.0 gas mileage


MJM316
03-03-2009, 11:48 PM
As many of you 6.0 owners know gas mileage SUCKS! :cry: What have some of you done to help get better mileage? Also what have you done that hasn't done a thing? Thanks :drinkup:

MrRob
03-03-2009, 11:49 PM
drive 45 constant everywhere & you might get 15mpg :)

MJM316
03-03-2009, 11:53 PM
I still think I would get 10.6:laugh:

MrRob
03-03-2009, 11:55 PM
everyday driving in town I get 10-11. Worst was 8 on a bobcat pull job back & forth thru town. When we do snow, I dont even bother.

MileHigh
03-04-2009, 12:00 AM
ouch....my diesel gets twice that.

I though my gasser was bad.

That's too bad to hear, I really like those trucks.

MJM316
03-04-2009, 12:17 AM
Ya I know so do I and I know I didn't buy the truck for gas mileage but when I'm runnin around town without a trailer or load in the box and fillin up 2-3 times a week it REALLY starts to hurt the pocket book

OrangeToys
03-04-2009, 12:45 PM
I have an '04 and my I have been getting 12-13 on the highway staying about 60-65mph. I did put on a Intake and Throttle Body Spacer, and Im going to put on exhuast soon which should increase a little more maybe 15-16. but guess ill find out.

when working i'll get 8-9 when pulling my trailer around with 2 mowers and some handhelds.

Brad Ent
03-04-2009, 01:07 PM
2500 HD 6.0L 12-13 empty, 9-10 towing

LawnTamer
03-04-2009, 01:15 PM
I have an 04 2500HD extra cab 4x4 longbed. The best I ever get is 12. I average just over 10, but I am always carrying payload, or towing. The only modification I have made is a K&N filter.

MJM316
03-04-2009, 10:14 PM
Ya the best I ever get is 10.6 and that is religiously. So what type of exhaust are you gonna try out denbowlawn? I could live with 15!

OrangeToys
03-04-2009, 11:58 PM
Ya the best I ever get is 10.6 and that is religiously. So what type of exhaust are you gonna try out denbowlawn? I could live with 15!

Im looking hard at Magnaflo, I haven't decide on duals or single. both have advantages depending on what you want from it, such as more torque or HP

MJM316
03-05-2009, 06:32 PM
Come on NO one else has done or tried anything to get better gas mileage on a gm 6.0 liter?:confused:

stuvecorp
03-05-2009, 07:18 PM
My friend has had a couple and they are not good, he had the 8.1 and got the same mileage with it. He told me to stick with the Dmax.

Junior M
03-05-2009, 07:20 PM
My friend has had a couple and they are not good, he had the 8.1 and got the same mileage with it. He told me to stick with the Dmax.
The 8.1 is a pig, I'd never own one, they are powerhouses but you'd have to own your own gas station to keep that thing filled up..

The 6.0 isnt all that bad though, we get better mileage than yall do for some reason.. ;)

stuvecorp
03-05-2009, 07:24 PM
The 8.1 is a pig, I'd never own one, they are powerhouses but you'd have to own your own gas station to keep that thing filled up..

The 6.0 isnt all that bad though, we get better mileage than yall do for some reason.. ;)

He did good with the 8.1, he went down south to pick up a Firebird and it averaged 10 the whole time on cruise.

MJM316
03-05-2009, 07:30 PM
I don't know whats up with mine then it doesn't even have 30,000 on it yet. I reset the trip everytime i get gas and chesk it a fill up and I'm consistanly at 10.6 :confused:

Junior M
03-05-2009, 07:30 PM
He did good with the 8.1, he went down south to pick up a Firebird and it averaged 10 the whole time on cruise.
really? the guys I know with them said they couldnt get but 7 or 8 on the interstate.. Course everybody drives different..

DanManofStihl
03-05-2009, 07:31 PM
That is all you you all are getting my 2002 work truck I had got 14 to 16 mpg it was a regular cab 2wd that was with maybe 500 pounds of crap in the bed no trailer.

MJM316
03-05-2009, 07:37 PM
Yup. i guess i should have stated it is a 4x4 ext cab short box. i also have 285s on it but I don't think the tires would drag the mpg that much??:confused:

GravelyNut
03-05-2009, 11:02 PM
The 8.1 is a pig, I'd never own one, they are powerhouses but you'd have to own your own gas station to keep that thing filled up..

The 6.0 isnt all that bad though, we get better mileage than yall do for some reason.. ;)I do as good with the 8.1 as the 6.0 can and have tons more torque. 12 on the highway towing 6K and around 9K to 10K in the truck weight.
Ask owners of both and they'll say comments like" Same gas use but more power".

MJM316
03-05-2009, 11:06 PM
I have a hard time believing that especially if its 4x4:rolleyes:. I know people that have them and they wish they got 10mpg with theres

corey4671
03-05-2009, 11:49 PM
another thing you have to factor in is the rear end. I have the 4.10 in mine. Real ox when it comes to towing, but 2200-2300 rpms to run 60 mph empty on the highway....that's why I get around 9-10 mpg. I also have 285's on it as well..needs a new air filter and would love a new exhaust.

Junior M
03-07-2009, 09:50 AM
I do as good with the 8.1 as the 6.0 can and have tons more torque. 12 on the highway towing 6K and around 9K to 10K in the truck weight.
Ask owners of both and they'll say comments like" Same gas use but more power".
Uh, I have, read my previous posts, we own a 6.0 and I know guys with 8.1's..

GravelyNut
03-07-2009, 06:51 PM
Uh, I have, read my previous posts, we own a 6.0 and I know guys with 8.1's..
Using the old fashion method of figuring MPG, mine is pretty consistant in pulling 12 MPG on the highway. That is figured over thousands of miles per trip. 2001 Chevy 8.1, Ext Cab, 3500 dually weighing 6242 lbs stock, with 4.10 gears, locking diff, stock sized load range E tires, and an Allison tranny. If the speed in the hills is kept in the 65 to 70 instead of 60 to 65 MPH range it does less shifting and uses the engine torque more. Trip weights northbound are in the 15-16K range with trailer and 9K southbound with trailer. And those are scaled weights.

OrangeToys
06-14-2010, 10:53 PM
Anyone done much to there truck to get better MPG?

Shane100
06-18-2010, 02:30 AM
As many of you 6.0 owners know gas mileage SUCKS! :cry: What have some of you done to help get better mileage? Also what have you done that hasn't done a thing? Thanks :drinkup:

07 classic 4X4 extended cab short box 2500HD
I got 7.7mpg on my last tank:mad:
I too would like to know if anyone has done anything to get better mileage.

zo6
06-18-2010, 03:35 AM
i still think i would get 10.6:laugh:

thats what i get, pullin the trailer with the mowers and a load of sand in the truck, thats what i get with only me in the truck..might get to the hefty 13mpg on highway unloaded

zo6
06-18-2010, 03:38 AM
that is all you you all are getting my 2002 work truck i had got 14 to 16 mpg it was a regular cab 2wd that was with maybe 500 pounds of crap in the bed no trailer.

2wd big difference

rcslawncare
06-21-2010, 07:39 PM
My 8.1 gets 10-12 mpg, If you need a gas engine, the 8.1 is a good one, especially with the Allison behind it. I have 4:10s also. Just turned 150k on mine and it runs out great still.

Junior M
06-21-2010, 10:03 PM
07 classic 4X4 extended cab short box 2500HD
I got 7.7mpg on my last tank:mad:
I too would like to know if anyone has done anything to get better mileage.
keep your foot out of it

And dont get an exhaust that sounds good cause you'll really have your foot in it listening to it. I speak from experience. :drinkup:

rcslawncare
06-21-2010, 10:09 PM
I also am putting the muffler back on mine as it is too load towing and i like to hear it, so it wastes more gas all the time...

Junior M
06-21-2010, 10:11 PM
I also am putting the muffler back on mine as it is too load towing and i like to hear it, so it wastes more gas all the time...
I wonder what mine would sound like with the muffler off? Hmm..


Wait, its welding from just ahead of the muffler back so I'd have to unbolt it right after the cat.. Screw that! that'd be ridiculously loud.

4 seasons lawn&land
06-21-2010, 10:23 PM
I av. 10 towing 2-8k throughout a tank. Seems fine to me. Worst I have seen is 7 towing 20K dump trailer. That was ugly though, wont do that again without a dually.

rcslawncare
06-21-2010, 11:05 PM
I wonder what mine would sound like with the muffler off? Hmm..


Wait, its welding from just ahead of the muffler back so I'd have to unbolt it right after the cat.. Screw that! that'd be ridiculously loud.

Yea, I had the local muffler shop delete the muffler with a y pipe, so it sounds good, but it drones like a cat back... The 8.1 does sound very good without a muffler though. The 6.0's sound decent also!

Junior M
06-21-2010, 11:12 PM
Yea, I had the local muffler shop delete the muffler with a y pipe, so it sounds good, but it drones like a cat back... The 8.1 does sound very good without a muffler though. The 6.0's sound decent also!
Hmm. I dont know if I'd like it that loud. Mine gets kind of annoying on long trips as it is. And its duals all the way back through a flowmaster 40series, I believe?

whole9er
06-21-2010, 11:42 PM
Has anyone put on a intake, if so did it improve gas mileage, im thinking about putting one on mine, intake/exhaust worked on my accord but wondering if anyones had sucess with the 6.0

zo6
06-22-2010, 01:22 AM
All you guys are sayin i get 11 12 normal, and 9 10 towing, isnt that pretty good considering how much **** we all pull with us, i get the same towin the trailers, or empty with only my skinny ass in the truck, absolutely no complaints about 10... But i will say this, i should got a 8.1, if i had done that i wouldnt be lookin for a diesel right now,6.0 just loses its mojo after 80000 or so.

STIHL GUY
06-22-2010, 11:29 AM
i get 10-11.5 MPG in my 2005 2500HD

GravelyNut
06-23-2010, 11:52 PM
My 8.1 gets 10-12 mpg, If you need a gas engine, the 8.1 is a good one, especially with the Allison behind it. I have 4:10s also. Just turned 150k on mine and it runs out great still.

I think the 4.10 gears have a lot to do with it. While it runs the RPM over what the 3.73s would see in D, as soon as you hit a grade, the 3.73 would cause a downshift. The 4.10s forestall the downshift and allow the engine to run in its torque band better. The 6.0 has no choice but to run in lower gears as it doesn't produce the torque that an 8.1 does.

Shane100
06-24-2010, 12:36 AM
I've also noticed a considerable difference when I use 100% gas vs E10.
E10 = around 8-9mpg
100% gas = 11-12mpg
All Towing.

It doesn't seem to matter how I drive. So I've gone back to driving fast:waving:

4 seasons lawn&land
06-25-2010, 09:51 PM
Ha, same here. But I never could tolerate going slow to see how much it helps...

rj68rs327
07-02-2010, 08:56 PM
I have a 2005 Crewcab with the 6.0
I get arount 10 mpg and once got 12 on the interstate.
I like the pulling power, but hate the mpg's.
Before this I had an F250 diesel. Liked the mpg's but the repair cost on the diesel really got in my pocket. The gasser is dependable vs. the diesel. So I take the good with the bad. I know of nothing that will make it get better mpg's and I have researched the heck out of it.

rcslawncare
07-02-2010, 09:08 PM
I think the 4.10 gears have a lot to do with it. While it runs the RPM over what the 3.73s would see in D, as soon as you hit a grade, the 3.73 would cause a downshift. The 4.10s forestall the downshift and allow the engine to run in its torque band better. The 6.0 has no choice but to run in lower gears as it doesn't produce the torque that an 8.1 does.

That makes sense and it is a good combo and like you said, stays in gear rather than search for gears like others I'v had. So your saying the 6.0 with 4:10s wouldn't really help as the torque still wont be there?

thewall
07-05-2010, 06:47 PM
This might seem like a silly question ,but why do you need trucks with such big engines,over here we have trucks not as big in size as yours but still pull trailers like yours,but our engines are only 2.5- 3.0l,if you go any higher the goverment sting you with a mega tax,also nobody has a petrol truck they are all diesel and we average about 25-35 mpg,the most common trucks are Toyota Hilux,Nissan Navana and the Mitsubishi L200

Darryl G
07-05-2010, 07:32 PM
I have an 03 2500 HD with the 6.0 and I don't even check it for mileage. I like the truck and I can't go with anything less, so I don't worry about it. I just expense it. At least it has a big tank, lol.

4 seasons lawn&land
07-05-2010, 08:10 PM
This might seem like a silly question ,but why do you need trucks with such big engines,over here we have trucks not as big in size as yours but still pull trailers like yours,but our engines are only 2.5- 3.0l,if you go any higher the goverment sting you with a mega tax,also nobody has a petrol truck they are all diesel and we average about 25-35 mpg,the most common trucks are Toyota Hilux,Nissan Navana and the Mitsubishi L200



Thats pretty cool. Get a pic of one on here. If Im not mistaken, over here its emissions on diesels and all the clean diesel crap. Smoke doesnt even come out of our diesels anymore, just soap bubles... okay not really but it is rediculous emmisions junk.

rj68rs327
07-05-2010, 09:28 PM
This might seem like a silly question ,but why do you need trucks with such big engines,over here we have trucks not as big in size as yours but still pull trailers like yours,but our engines are only 2.5- 3.0l,if you go any higher the goverment sting you with a mega tax,also nobody has a petrol truck they are all diesel and we average about 25-35 mpg,the most common trucks are Toyota Hilux,Nissan Navana and the Mitsubishi L200

I had a Chevy Silverado 1/2 ton with the 5.3, it was really hard on the truck pulling my 18' trailer loaded. Hills were a nightmare. With my 1500HD and the 6.0 liter it takes hills great and the loader trailer hardly squats the back of the truck. The only thing I hate is the gas mileage, it stinks. 10 mpg is average. It is dependable and that was what I was looking for. My F250 diesel was always down and in the shop. So I went back to the gasser. I wish there was something that would improve the mpg, but I haven't found it. yet.

Darryl G
07-06-2010, 02:35 AM
This might seem like a silly question ,but why do you need trucks with such big engines,over here we have trucks not as big in size as yours but still pull trailers like yours,but our engines are only 2.5- 3.0l,if you go any higher the goverment sting you with a mega tax,also nobody has a petrol truck they are all diesel and we average about 25-35 mpg,the most common trucks are Toyota Hilux,Nissan Navana and the Mitsubishi L200

Because we're American's and we like to consume as many natural resourses as possible to justify going to war over them....duh. :weightlifter:

thewall
07-07-2010, 03:08 PM
Thats pretty cool. Get a pic of one on here. If Im not mistaken, over here its emissions on diesels and all the clean diesel crap. Smoke doesnt even come out of our diesels anymore, just soap bubles... okay not really but it is rediculous emmisions junk.

193321

193322

193323

Here are some pics of the most popular trucks in the UK,yes it's all down to emissions hereyou are taxed on the emissions your vehicle puts out,you can have it rechipped to enhance performance,but when it is tested every year you have to put it back.

tnmtn
07-07-2010, 04:59 PM
i don't have a 6.0 but wonder if something like this would help. dropping the rpm's couldn't hurt and it is less than a diesel.

http://www.gearvendors.com/cg2wd4s.html

good luck,

thewall
07-07-2010, 06:07 PM
An auto gearbox ALWAYS uses more fuel than a manual box:nono:

davis45
07-07-2010, 06:41 PM
I had an 03 4x4, 4 door short bed with a throttle body spacer, duals, and an intake and got 14mpg just drivin. 9-10mpg pullin the 22ft enclosed down the interstate. I didn't use it for lawn business so I dont know how it would be with a trailer stopin and goin through town.

Just took my 99 2500 4x4 cummins diesel on a road trip. Got 22mpg runnin 74 down the interstate for 200 miles each way.

4 seasons lawn&land
07-07-2010, 11:10 PM
193321

193322

193323

Here are some pics of the most popular trucks in the UK,yes it's all down to emissions hereyou are taxed on the emissions your vehicle puts out,you can have it rechipped to enhance performance,but when it is tested every year you have to put it back.

Dude! No way are those moving a load like a 2500-3500. You hook up 14k to that and your spinning your wheels... literally! If you actually got it moving youd soon be in the weeds.

We have those Nissan frontiers here. Its not even a half ton truck.

GravelyNut
07-08-2010, 09:29 PM
That makes sense and it is a good combo and like you said, stays in gear rather than search for gears like others I'v had. So your saying the 6.0 with 4:10s wouldn't really help as the torque still wont be there?
The highest torque 6.0L is the 380 lb-ft model. The 8.1 was rated at 454 lb-ft so the 6.0 would always have to be in a lower gear to get the torque needed to move a max load. In other words, if you load the 6.0 down and load the 8.1 to the same load, the 6.0 will lug while the 8.1 runs away with it.
There is a bad side to having all that torque and that is shown when you hook a trailer on and don't load the bed of the truck. Tire smoke and tire squeal do happen. A 6.0L with 4.10s would still lose out in the torque capacity to the 8.1 and 3.73s. 1558 lb-ft at the axle vs 1693 lb-ft. Change that to 4.10s for the 8.1 and it goes to 1861 lb-ft with all trucks figured in 1:1 ratio at the tranny and locked up torque converters/pumps.

rcslawncare
07-09-2010, 02:00 AM
yea, that makes sense. I like the way my 8.1 pulls and it always has enough power.

corey4671
07-09-2010, 02:49 AM
This might seem like a silly question ,but why do you need trucks with such big engines,over here we have trucks not as big in size as yours but still pull trailers like yours,but our engines are only 2.5- 3.0l,if you go any higher the goverment sting you with a mega tax,also nobody has a petrol truck they are all diesel and we average about 25-35 mpg,the most common trucks are Toyota Hilux,Nissan Navana and the Mitsubishi L200

because 234 years ago we kicked your ass so we could. and then as if you didn't get enough the first time around you came back in about 40 years and got your asses handed to you again. :laugh: then I'm pretty sure we bailed your asses out again in World War !! :gunsfirin

thewall
07-09-2010, 06:20 PM
then I'm pretty sure we bailed your asses out again in World War !! :gunsfirin

No we cleared the path so you didn't get your boots dirty:nono:

Sorry couldn't help myself. end of:drinkup:

GravelyNut
07-09-2010, 10:06 PM
No we cleared the path so you didn't get your boots dirty:nono:

Sorry couldn't help myself. end of:drinkup::laugh:
In 1958 dad had to attend a Comm class at GCHQ with some other Americans and Brits. And scored #1 in the class. Relatives of mine have been kickking Brit butts since 1776. :usflag: :drinkup:

corey4671
07-10-2010, 02:26 PM
:usflag::usflag::usflag::usflag::usflag::usflag::usflag::usflag::usflag::usflag::usflag::usflag: :usflag::usflag::usflag::usflag::usflag::usflag::usflag::usflag::laugh:
In 1958 dad had to attend a Comm class at GCHQ with some other Americans and Brits. And scored #1 in the class. Relatives of mine have been kickking Brit butts since 1776. :usflag: :drinkup:

Messenger Bros.
07-10-2010, 04:05 PM
i have a 2010 gmc 2500hd with the 6.0 ext cab and long bed and pulling a trailer in town with a/c i got 11 and highway a/c on and doing like 80 the whole time i got 13-14 no trailer

360ci
07-10-2010, 11:06 PM
What axle ratio is everyone running? I know the 3.73 and 4.10 isn't much of a difference, but taking that into consideration plus the OEM tire size which is larger on the mid to highline models only will make a difference. I'm interested in getting a new 6.0L V8 6 speed auto HD, and gas is the same price as diesel here in Ontario, and the diesel engine option is almost $12K = no thanks, gas it is!

I have an '04 and my I have been getting 12-13 on the highway staying about 60-65mph. I did put on a Intake and Throttle Body Spacer, and Im going to put on exhuast soon which should increase a little more maybe 15-16. but guess ill find out.

when working i'll get 8-9 when pulling my trailer around with 2 mowers and some handhelds.

Throttle body spacer won't increase anything, sorry. All it does is make the air take longer to get to the engine. Sell it.

Messenger Bros.
07-10-2010, 11:29 PM
i have 3.73 with 245/75-16 tires. yeah the diesel is a nice option but eventually you will have a 5000 bill for injectors and injector pump

corey4671
07-10-2010, 11:32 PM
got the 4.10 on my 04 2500HD with the 6.0 get around 11 MAYBE 12 pulling the trailer...thing is...I didn't buy this truck to get gas mileage...I bought it to haul my trailer and equipment. I can't buy a gas burning truck with the torque and power to move that load and still get great mileage. it's a trade off...

360ci
07-11-2010, 10:41 AM
i have 3.73 with 245/75-16 tires. yeah the diesel is a nice option but eventually you will have a 5000 bill for injectors and injector pump

I agree. I prefer diesels, just not the V8 design (I6 fan!) and for $5K, you can get a rebuilt gas V8 with a good warranty! Now, that's not to say that the diesel will cause problems before the gas engine either. Maintenance is key in all respects no matter the engine. Hauling and towing require you to alter maintenance to the severe schedule in the owners manual. A lot of folks fail to realize this and they blame the truck for not being able to handle what they throw at it. Neglecting oil changes are the main cause of failures. If I got a diesel engine, I'd install a by pass filter system to increase oil and engine life together.

360ci
07-11-2010, 10:47 AM
got the 4.10 on my 04 2500HD with the 6.0 get around 11 MAYBE 12 pulling the trailer...thing is...I didn't buy this truck to get gas mileage...I bought it to haul my trailer and equipment. I can't buy a gas burning truck with the torque and power to move that load and still get great mileage. it's a trade off...

Exactly. The only downside to buying a HD truck for me, is the fact that I don't need it to do errands around town. However, with the car broke and on the selling block as I just can't bear to fix it as it's 12 years old, I'm at a loss. I need passenger space and payload and towing capacity for all my work and personal activities. Sure, I can get another second vehicle, but even if I buy it outright, I'll be paying more in maintenance and insurance than I would have to fork over to pay for the additional gas I'll need to use in an HD truck to do those same errands.

Most folks can only be so efficient. I might break down and fix my car as the body is in fine shape yet for the year, but again I'd rather not so I can save $2K a year on maintenance and insurance costs only to save 5mpg on a very part time basis.

A WT 25000 GM crew cab short box with the V8 gas engine is one of the better deals out there in terms of capability per dollar. GM is known for slightly better mileage overall than its current competitors and parts are everywhere for the small block engines, and are decently priced. In Canadian dollars with current incentives and rebates, plus a few options (not including tax) I can get the said above truck for $36K before tax and delivery. Retail is nearly another $10K on top of that if you don't include current discounts and incentives. Friggen insane for a basic truck if you ask me. However, us Canadians pay the vehicle premium of about 15-20% more than you US folks. Even $36K is high to me, but unfortunately that's the going rate these days. I'm cheap, there's nothing else to it. lol.

corey4671
07-11-2010, 11:32 AM
Exactly. The only downside to buying a HD truck for me, is the fact that I don't need it to do errands around town. However, with the car broke and on the selling block as I just can't bear to fix it as it's 12 years old, I'm at a loss. I need passenger space and payload and towing capacity for all my work and personal activities. Sure, I can get another second vehicle, but even if I buy it outright, I'll be paying more in maintenance and insurance than I would have to fork over to pay for the additional gas I'll need to use in an HD truck to do those same errands.

Most folks can only be so efficient. I might break down and fix my car as the body is in fine shape yet for the year, but again I'd rather not so I can save $2K a year on maintenance and insurance costs only to save 5mpg on a very part time basis.

A WT 25000 GM crew cab short box with the V8 gas engine is one of the better deals out there in terms of capability per dollar. GM is known for slightly better mileage overall than its current competitors and parts are everywhere for the small block engines, and are decently priced. In Canadian dollars with current incentives and rebates, plus a few options (not including tax) I can get the said above truck for $36K before tax and delivery. Retail is nearly another $10K on top of that if you don't include current discounts and incentives. Friggen insane for a basic truck if you ask me. However, us Canadians pay the vehicle premium of about 15-20% more than you US folks. Even $36K is high to me, but unfortunately that's the going rate these days. I'm cheap, there's nothing else to it. lol.

yeah my what you would call personal vehicle is a 98 4door 4wd blazer I picked up for $4500. had 100k miles on it. in great shape. loaded to the tilt. gets around 20mpg and has room for the two kids or I can fold the seats down for cargo. if need be I can hook my 6x10 trailer to it. the 4.3 v6 handles a small load just fine. I just despise having to unhook my trailer from the 2500. I back the trailer in the shed at night and I'm ready to roll the next morning

360ci
07-11-2010, 05:17 PM
I know. I have a smaller utility now and it takes 10-15min to pull it out, get it connected, check the lights, etc. I work near the downtown area, so parking is minimal at best otherwise I'd just lock what I can in the Durango and leave it connected.

My Durango R/T was bought for previous travel trailer use, but it still gets 18-19mpg at 55mph, the most common road speed in my area. Around town it doesn't go that great. I thought about trading it in on something more fuel efficient, but I've decided if I trade it in, I want to get a truck that can plow.

GravelyNut
07-15-2010, 05:33 PM
i have 3.73 with 245/75-16 tires. yeah the diesel is a nice option but eventually you will have a 5000 bill for injectors and injector pump
4.10 with 215/75-16 on mine. So I get the low gearing and smaller tires which puts it at its worst for highway use but doesn't suffer from trailer towing.


All engines have sweet spots with their gearing and tires. We had a Ford E-150 that sucked at 55MPH but when you ran 65-70 the MPG went up. There is such a thing as gearing them too high. The engine is most efficient at near its peak torque point. But wind drag may kill that.

propertymanagement2010
07-16-2010, 11:31 PM
do an air intake + throttle body spacer....will help a lil on the mpg...overall tho you're looking at 8-12 tops....if you're making $ though you'll learn to get used to it.

360ci
07-17-2010, 12:08 AM
do an air intake + throttle body spacer....will help a lil on the mpg...overall tho you're looking at 8-12 tops....if you're making $ though you'll learn to get used to it.

A throttle body spacer does nothing. Several tests have proven that it might gain 1hp, but you lose 2-4lb ft of torque as the air takes longer to get into the engine. If you want a TBS, save your money and just extend your air intake pipe.

joed
07-17-2010, 09:34 PM
I have a 2000 GMC 2500 ext. cab 4X4. In the city I'll get 20-23 L/100KM depending on the time of year and what not. On the highway I get about 17-18 L/100KM. I think that works out to about 12 mpg/city and around 15 mpg on the highway. Not great. I'm actually looking at going down to a 1/2 ton as I do no towing and mainly use the truck to haul around a few smaller mowers when I do my part-time lawn business during the spring/summer/fall. Was looking at getting a 2010 GMC Sierra with a 5.3L engine/6 speed tranny. Can get the SLE model for about $35K with tax and all. Other models I'm looking at are the Ford F150 with 4.6L, Toyota Tundra with 4.6L engine or the Dodge Ram with the 5.7 Hemi. Price the Dodge, GM, Ford are all pretty close. The Toyota is way up there since they don't have any price incentives like the other 3. I want the truck that gives me the best fuel economy. Not sure if that would be the GM, Ford, Dodge or Toyota. Anybody know?

rj68rs327
07-18-2010, 11:47 AM
I have a 2000 GMC 2500 ext. cab 4X4. In the city I'll get 20-23 L/100KM depending on the time of year and what not. On the highway I get about 17-18 L/100KM. I think that works out to about 12 mpg/city and around 15 mpg on the highway. Not great. I'm actually looking at going down to a 1/2 ton as I do no towing and mainly use the truck to haul around a few smaller mowers when I do my part-time lawn business during the spring/summer/fall. Was looking at getting a 2010 GMC Sierra with a 5.3L engine/6 speed tranny. Can get the SLE model for about $35K with tax and all. Other models I'm looking at are the Ford F150 with 4.6L, Toyota Tundra with 4.6L engine or the Dodge Ram with the 5.7 Hemi. Price the Dodge, GM, Ford are all pretty close. The Toyota is way up there since they don't have any price incentives like the other 3. I want the truck that gives me the best fuel economy. Not sure if that would be the GM, Ford, Dodge or Toyota. Anybody know?
A good friend of mine had the Dodge with the Hemi, It gets around 12 mpg.
The 4.6L in the Ford gets around 15 mpg.
The 5.3L in the GM, I had a 5.3L in a Silverado. Decent motor, just on power when pulling a load, this is why I went with the 6.0L.
The Toyota? I don't know how they do. If I had it to do over again, I would trade off the power vs. the towing of the 6.0L and go back to the 5.3L of the Chevy or GM. I had a older Chevy with a 5.7L that I loved. The truck got decent mpg's. and towed decent. GM sold the rights of the 5.7L to toyota a few years ago, big mistake on GM's part. Good luck.

GravelyNut
07-18-2010, 01:35 PM
I have a 2000 GMC 2500 ext. cab 4X4. In the city I'll get 20-23 L/100KM depending on the time of year and what not. On the highway I get about 17-18 L/100KM. I think that works out to about 12 mpg/city and around 15 mpg on the highway. Not great. I'm actually looking at going down to a 1/2 ton as I do no towing and mainly use the truck to haul around a few smaller mowers when I do my part-time lawn business during the spring/summer/fall. Was looking at getting a 2010 GMC Sierra with a 5.3L engine/6 speed tranny. Can get the SLE model for about $35K with tax and all. Other models I'm looking at are the Ford F150 with 4.6L, Toyota Tundra with 4.6L engine or the Dodge Ram with the 5.7 Hemi. Price the Dodge, GM, Ford are all pretty close. The Toyota is way up there since they don't have any price incentives like the other 3. I want the truck that gives me the best fuel economy. Not sure if that would be the GM, Ford, Dodge or Toyota. Anybody know?
The Ford and GM will both get about the same MPG with the comparable setups.

cpmnate
07-18-2010, 01:40 PM
This poor mileage on the 6.0 is the reason we run 8.1 engines in all three of our trucks, no shortage of power, allison transmission and same mileage working them.

GravelyNut
07-18-2010, 03:07 PM
This poor mileage on the 6.0 is the reason we run 8.1 engines in all three of our trucks, no shortage of power, allison transmission and same mileage working them.
GM should have dropped the 6.0 and kept the 8.1L. The 6.0L can't match the pulling power that the 8.1 has. Plus the 8.1 had plenty of room to grow, but GM didn't push it. Even the GM HP2 crate motor version of the 8.1 stepped the HP up to 420 HP. HP3 stepped it up further to 525HP/560 lb-ft. That is Diesel torque ratings territory.
Problem was, the Allison T-1000 coundn't handle much more than the 8.1 put out stock without upgrades. The tailshaft has an RPM limit of 4600 RPM. Something the 8.1 hits in 3rd. A little work ( and some money ) can add 200 HP to the engine. Alot of work ( and big money ) will get you to 950-1000 HP.

joed
07-18-2010, 05:10 PM
Thanks for the input. I appreciate it. The set ups for the trucks I'm looking at:

Ford: 4.6L engine, 6 speed auto, 3.55 rear axle.
GM: 5.3 L engine, 6 speed auto, 3.42 rear axle
Dodge: 5.7L engine, 5 speed auto, 3.55 rear axle

The other possibility I was thinking of was a toyota tacoma double 4X4, 6 ft box, 4.0L V6 engine. It's smaller than the other three but would be alright for my needs. Would the tacoma provide better fuel economy than the other 3?