View Full Version : 2500HD 6.0 Gas milage.....

05-26-2004, 09:22 AM
'04 GMC Regular cab 2500HD 6.0 4.10's

Here is my milage history starting with MY first figureable tankfull....

1) 10.53 mpg 304 miles driven 28.86gal
2) 8.94 mpg 246 miles driven 27.53gal
3) 8.31 mpg 256 miles driven 30.81gal
4) 8.92 mpg 274 miles driven 30.73gal

So you can see, all these fills were allmost full tanks, all filled up to filler neck. The last two, the low fuel light came on. Thats all I have now, as I only have about 1600 miles on it.

I was expecting MUCH better. Granted, most of these miles are towing my 16' open trailer (Just under 5,000lbs), and the others are hot-footing it around town on short trips.

I was expecting the double digit milage to continue after that first tankfull. Guess I was wrong.

It runs like a raped ape, so its not like something is mechanically wrong with it.

Anyone else experiencing single digit milage like this?

I would like to think that on a long highway trip, I could see 12mpg, but that may be it.

I purposly DIDN'T consider a Diesel, mainly due to the stop/go, around town driving that I do. Think I may have gotten 12 had I got the Duramax.

Any of you 6 Liter guys want to post your numbers?

Tx Firefighter
05-26-2004, 09:42 AM
Two guys at my station have 6 liters. Neither of them has ever gotten over 13 unloaded on a long highway trip. Both of them are now looking at diesels.

I'm very sure the Duramax would have gotten much better than 12. My diesel gets 18 towing my tandem axle trailer loaded with equipment.

05-26-2004, 09:47 AM
My max speed during the mowing week is about 35mph with about 3-5 minutes between stops.

I've had the truck almost exactly 3 full months and only have 1,606 miles!

Randy Scott
05-26-2004, 10:09 AM
I have a friend in the business that had the same set-up as you and was getting the same terrible mileage. He got rid of it.

05-26-2004, 10:15 AM
I guess I cant complain.

My 454 in my other truck gets a consistant 8-9 mpg, and this new truck will run circles around the big block in terms of power, so , power cost $ and gas = $.

Eric 1
05-26-2004, 06:17 PM
That makes me feel better, mine is older and does about 9 mpg, i was going to get a newer truck in hopes of getting better mileage, but I am thinking now that it will not improve that much and may just take a loan and get a mid 90s diesel.

guess its one of those things that comes with this business.

05-26-2004, 06:20 PM
I guess with only 1600 miles, It's hardly broken in yet.

I need a nice long highway trip to get some highway figures.

05-26-2004, 06:55 PM
I hope you get more responses concerning MPG and diesels.
I'm surprised that your mileage is that low but, considering it's new and pulling a trailer??? it might improve somewhat over time.

A higher gear (lower numerically) might had helped.
I would like to see what you get with less hot-footing.

I saving for a Diesel 2wd 3/4ton truck, probably a Ford and my whole reason for this purchase is mileage and torque.

My present truck is a 3.0 1997 Ranger, it's MPG stays around 15-19mpg. My lowest is 13 and highest is 19mpg.
I believe I could get that in a full size truck!!

05-26-2004, 07:04 PM
Originally posted by bugspit

A higher gear (lower numerically) might had helped.
I would like to see what you get with less hot-footing.

Gear ratio choice wasn't an option. I'd likely prefer a 4.56 if it was available. For the around town, slow speed driving that I do, the lower the better.

Less hot-footing, huh?....Yeah....me to! :p

It's just too much fun! This things quicker than 95% of the cars out there! Fun, fun, fun!!!

little green guy
05-26-2004, 07:12 PM
yah my 04' HD is getting around the same, it seems like I fill it up every other day. I think it's getting a little better now that I'm over the initial "wow this things got ballz and I think I'll use all of it's power everytime I pull out" phase, my foot seems a little light now.

05-26-2004, 07:16 PM
Speaking of heavy foot.

This is my first "drive by wire" vehicle. Stupid gas pedal is SOOO lightly sprung that on bumpy roads, my foot is bouncing on the thing and making the bucking road....buckier!

So far thats my only complaint......No throttle "feel".

05-26-2004, 07:16 PM
Originally posted by TLS
Less hot-footing, huh?....Yeah....me to! :p

It's just too much fun! This things quicker than 95% of the cars out there! Fun, fun, fun!!!

Well, that explains your mileage, as if you didn't know:D

I'm not sure what is offered as far as gear ratios, diesels might need lower gears???:confused:

05-26-2004, 07:23 PM
Originally posted by little green guy
it seems like I fill it up every other day.

Sounds like you got the Short Bed, huh?

26 Gal tank :(

Heck your lucky to go 200 miles between fillups.

05-27-2004, 09:08 AM
Hey Guys,
We got a 2002 suburban with the 6.0 and usually got 13 to 16 mpg (if my wife is driving). That is towing our 31 camper or just around town.

Now my truck is a 96 F250 power stroke and I love it. Its got 130,000 on it, tows our 16' loaded enclosed like a dream, has an e-z dumper in it so this baby is loaded down when working and I still get 13 to 16 mpg. I think thats great considering my old 3500 chevy with a 454 couldn't get a double digit mpg if its life depended on it.

In short, the diesels my cost more to purchase but they have so many advantages that the extra cost is a wash!!!!!!

05-27-2004, 07:36 PM
The 2500 HD with the 6.0 if I'm not mistaken doesn't even have a mileage estimate on the window sticker. I know the 8.1 doesn't. It is not a vehicle to buy if you are crunching numbers on mileage. It is built for sheer power and towing capacity.

05-27-2004, 10:38 PM
Thanks for the info guys.

13 - 16 mpg in a 'Burban!!! Wow, your wife must REALLY baby it! My Dad has a Diesel 'Burban and gets 16 solo.

As for the EPA milage sticker, I believe the cutoff for the EPA ratings is 8000lbs GVW.


As for crunching milage numbers....yeah I am because mine seem to be getting 3-4mpg BELOW what other people are averaging with the same or heavier truck! Remember, mine is a regular cab, and weighs in less than 5500 lbs!

I'm just hoping there isn't something wrong with it.

05-27-2004, 10:43 PM

I have the 2500 EXT CAB and I get 16 on a really good day empty and usually 11 -12 with my trailer. It really sucks and now I wish I had bought a diesel especially with these gas prices.

05-27-2004, 10:46 PM

This is figuring out your MPG on a calculator, not the DIC, right?

Your trailer towing, is it around town 25-35mph stop and go towing or 60mph highway towing?

16......WOW! Diesels aint getting much better than 16.

05-28-2004, 06:14 AM
A 4.56 would kill you in gas. I also think that you would be out of the torque range and that it would not drive as well. Always to high in the RPM range. With such a small trailer that would be overkill. A 3.73 (I think that is next down) would get you into the 10 range. My friend has the 2500 burban and that is what he gets with that set up.

OLEO, What gear do you have?

Just remember that a raped ape drinks heavy.

05-28-2004, 08:32 AM
Originally posted by PMLAWN
A 4.56 would kill you in gas. I also think that you would be out of the torque range and that it would not drive as well. Always to high in the RPM range.

Actually, I disagree with you.

At least for MY situation, it would probably increase it.

STOP - GO, Repeat.

Snake around town 35mph MAX, yesterday I hit 45 for a mile!

3-5 minutes between stops.

Remember, the 6.0 reaches MAX torque at 4000 rpm, and MAX Hp at 4400 rpm.

05-30-2004, 12:19 PM
TLS, I am a full time GM technician and part time LCO. If there was a problem (running too rich) the computer would see it and turn on the Service Engine Soon light. As for mpg estimate, I know there is one (it may be the 8.1) engine package that they don't even put the estimate on the window regardless of what the GVW is. I think it is that way on the 2500HD with the 6.0 too, but I may be wrong. Either way, from your previous posts on how it runs like a "raped ape" and really has a lot of get up and go, I would say that is most of your problem. Don't get mad now, I ain't trying to start anything. It is hard not to lay into one when you have the power to do so, just don't expect it to get good gas mileage if that is what you are doing.

05-30-2004, 12:49 PM
I have a 04 2500HD 6.0, I didn't buy it for the gas mileage, it has pulled and stopped effortlessly with everything I have loaded/pulled with it so I am very pleased.

05-30-2004, 10:51 PM
We just sold a 2002 Chevy 2500HD ext cab 4x4 6.0 that was getting 11.5 mpg empty and about 8.5 towing a 7x16 trailer with about 3,000 pounds, it had about 50,000 miles on it. It had one size bigger tires than factory 289's. When we first got it the best it got with factory tires was 15mpgs on a trip to the beach traveling interstate. We just bought a Chevy 2500HD ext. cab 4x4 Duramax diesel, it has about 900 miles on it and is averaging 15mpg towing and supposing it will get even better after it is broken in.

05-31-2004, 10:38 PM
No chevy here, but a thought anyway. I have a new F250 with 5.4 V8. It sucked for gas mileage. It was getting 9.5 mpg pulling and only 14 on the road empty. As I have finally got 6000 miles on it, I have noticed the mileage increasing. I think its finally breaking in some. Its at 10.5-11.8 pulling and running the AC. Those numbers depend on how much weight I am pulling.

05-31-2004, 10:45 PM
I dig these MPG posts, would anyone be using a Dodge Dakota with a V8? I'd be interested in 2wd and 4wd numbers if you got'em.

It gripes my butt that my Ford Ranger 3.0V6auto gets only between 14-19 mpg...I could'a had a V8!

06-01-2004, 06:16 PM
My neighbor has an 04 HD with the Duramx. He's getting 18 driving around town to/from work and 23 on the highway between Seattle and Montana pulling a small trailer.

I wish I could get the Durmax for my Suburban...

06-01-2004, 06:58 PM
I get about 15 mpg in my 4.0 liter V6 Ford Explorer towing a small trailer, 5x8, approximately 1200 pounds. This is mainly b/c I am a big leadfoot.

06-01-2004, 10:01 PM
well there goes me justifying a new truck to myself. My 96 dodge with 318 gets average 15 mpg towing equipment three-four days a week. I can tell a diffence when it gets to be oil change time.

06-01-2004, 11:51 PM
My GF's brother borrowed the truck to move the other day. He was real nice and filled the tank right before he gave it back. Unfortunately, I don't know how much he put in, so there is a wasted tankfull for milage calculation. Oh well!


I'd like to meet that guy getting 23mpg highway while towing a trailer....ANY trailer! VERY few Dmax's are getting above 20 mpg Highway when SOLO. Mainly those that stick to 55-60 mph, have a bed topper and drive like an old man. Maybe your neighbor is just looking at the DIC computer for milage. Those are KNOWN to be highly inaccurate, and exaggerate the numbers by 3-4 mpg.!!!

Still waiting for a nice trip to take that is all highway.

Thanks for the input....keep it coming!

Potomac Lawns Inc.
06-02-2004, 06:43 PM
My 2003 2500HD crew cab with D/A get between 14-21mpg that depends on what trailer if any is on it and if it is open highway or not.

06-05-2004, 05:08 AM
I drive a nissan froniter single cab. The advantage is higher mpg and less cost passed on to the customer becuase i dont have to pay for more gas on the bigger exspensive trucks.

It holds it own though it is a 4cyl I can safly tow 3500 lbs.

06-06-2004, 11:38 PM
I have a 2500 HD with 4:10. 10mpg in town with trailer, 15mpg interstate unloaded. I checked it when it had 4K miles on it. I do have a K&N filter on it, and lead foot.

Premo Services
06-07-2004, 09:01 AM
Originally posted by moneyman
I drive a nissan froniter single cab. The advantage is higher mpg and less cost passed on to the customer becuase i dont have to pay for more gas on the bigger exspensive trucks.

It holds it own though it is a 4cyl I can safly tow 3500 lbs.

That is good about the savings you and your customers are seeing. But, I had a 1/2 ton gmc 4x4 pickupw/ 350 gas enging. It pulled about the weight youy are saying great, but in situations where I had to make sudden stops, is where it didn't do too well. All the trailer weight goes to pushing the truck foward making it very hard to stop. Always kept a good distance and drove slower in traffic to compensate for it, but there were a few times I didn't think I was going to stop...

06-12-2004, 11:38 AM
I bought a 04 2500HD 8.1 w/allison. The first weekend I was getting 13 - 14 mpg for 500 miles. After 500 miles I started pulling my 24 ft. enclosed trailer, weigh about 8000 lbs. I have 1000 miles on it today and average about 9.0 - 9.5 mph around town and skipping about 20 miles up and back to jobs. It is a regular cab long bed. Talk about power, I beleive it is the strongest truck in production now ( work truck). I know the torque is not rated at that of a diesel, but that h.p. and the weight of the truck. We have a cummings and two power strocks, they don't come close. With the weight of what we tow, mileage is not all that lower. I am glad now that I got the 496 over the 6 liter. It will flat out burn them down. HA HA.

06-15-2004, 10:20 PM
I have an old GMC POS that I just can't bring myself to get rid of. But my best friend has an '04 GMC Extended Cab Dually 4WD with the D/A combo. It is stock, with the exception of an Edge Juice controller. He consistantly gets 16~18 in town and 20~22 on the highway. That includes pulling a 6,000 lb goosneck setup. He also put down 351 hp/663 tq at the tires on a DynoJet.
BTW. The truck will destroy all four tires in 2nd gear. javascript:smilie(':D')