View Full Version : Uhgg Poor fuel mileage 95 F-450

Gravel Rat
11-12-2005, 02:58 AM
I checked my fuel mileage today I did some real light hauling some furniture then a couple days ago some scrap aluminum. I was kinda disapointed to see 9.5 mpg I will check it again next time I fill up :rolleyes: .

What I have been told is becoming true these 95-97 F-450s with the PSD are pigs on fuel and the guys that own 6.0 F-450s are having the same complaint.

If I'am only getting 9.5 mpg with light loads what I'am I going to get with a full max gvw load which I havent had yet if it drops below 9 mpg its gonna be expensive to run this truck :dizzy:

My 89 F-450 IDI would get 11 mpg loaded it really didn't matter if it was 2000lbs to 7000lbs the truck got 12.5-13 mpg unloaded. I hope I didn't make a mistake and buying a PSD :help:

Is this normal for a F-Superduty (F-450) with PSD power to get bad mileage geez 9.5 mpg thats disgusting I had a 88 F-Superduty with 460 power would get 8mpg and the that truck weighed 8300lbs the 95 weighs 8400.

The 460 was bad it would eat up 1/2 the profits in fuel hauling sand and gravel and that was 3.5-4 years ago when regular gas was considered cheap. The 460 liked the fuel when the truck was grossing 16,000lbs you could litterally watch the needle drop the engine screamed feed me :cry:

I'am thinking about going to a 1 ton again and put a 11x8 dumping flatdeck on it if it will net me better fuel mileage and I mean better something like 14 mpg empty and 12mpg loaded. If a 350 won't net me better mileage then I will just suffer with my current trucks bad fuel mileage I will just have to squeeze the customer for more money if they squeal tough tar paper.

What do you think should I raise my trucking rate to 60 dollars per hour I'am currently 50 dollars per hour I may even make a minimum chage 100 dollars for a hauling job plus labour if involved. I currently paying $4.15 per US gallon for diesel fuel.

11-12-2005, 03:36 AM
Have you considered High performance Accel or Taylor 8mm spark plug wires, perhaps a high performance cap and rotor AND a high performance (high voltage output) ignition coil, in addition to double platinum spark plugs?

Does it have dual exhaust? If so, does it have headers?
How about a high air-flow / high performance air filter assembly?

Anything you can do to increase air flow or spark will help, anything to increase fuel will not.

And, learn to always coast to a stop.


11-12-2005, 09:47 AM
Have you considered High performance Accel or Taylor 8mm spark plug wires, perhaps a high performance cap and rotor AND a high performance (high voltage output) ignition coil, in addition to double platinum spark plugs?

I think he is referring to a Powerstroke diesel.

Gravel Rat
11-12-2005, 03:26 PM
Yup diesels don't need no stinking spark plugs :laugh:

My question is it normal for a PSD to be that piggy I know you guys run mason dumps etc what do you get for fuel mileage.

Heres the thing if I do go for a F-350 4x4 its going to weigh around 7500lbs with a dumping flatdeck with 4:10 gears I'am wondering if its going to just as piggy.

I used to grumble that the old 7.3 IDI was a little underpowered for highway travel but atleast it got good fuel mileage.

Travis Followell
11-12-2005, 05:30 PM
You may want to consider one of these


11-12-2005, 08:12 PM
Hey Gravel Rat, have you tried unplugging your map sensor and ICP sensor to see if the truck runs any better? Does the engine seem a little sluggish off idle? I'd be willing to bet you have a sensor that's not at 100%, especially if they are original.

Gravel Rat
11-12-2005, 09:03 PM
The truck is actually running a little better than it did before. The truck when I bought it supposidly it has a rebuilt engine. I don't know what is original and what is not. I'am going to check the mileage again the next time I fill up.

If its the same then I will start investigating the problem as I checked a few times before and it was around 12mpg.

11-15-2005, 01:18 PM
An F-450 is gonna have at least 4:10's & maybe even 4.88's in it. Thats where your losing mileage most likely. The lowest gears you can get in a 550 is 4.30's I believe.

Gravel Rat
11-15-2005, 03:56 PM
I know I have 4:63s my F-450 with 7.3 IDI N/A had 5:13s it used to be topped out at 50 mph my 95 PSD 450 will do 68 my first F-450 a 88 with 460 gas 4:63s 69 mph.

Tare weights
88 F-450 11' dump box 8300lbs
89 F-450 12' flatdeck 7800lbs
95 F-450 12' Flatdeck 8400lbs

I really don't know why the 95 weighs 500lbs heavier than the 89 both diesels both the same wheelbase with the same sized deck. Its got to be the deck on the 95 is slightly heavier. The 88 was a a dump and it weighed 8300lbs I imagine by the time I get a dump on the 95 it will be in the 9000lb range :eek:

The 460 weighs 720lbs a 7.3 PSD your looking at 950lbs about 230lbs off your payload with a diesel.

The 88 would haul great put 8000lbs of gravel on that truck it had lots of power I wish I kept a better fuel mileage log on the truck. It used to get around 6-8mpg per gallon at todays prices it would cost.

88 460 gas 8 mpg 18 dollars in fuel per hour at todays prices
89 7.3 IDI 11 mpg 14 dollars " " " " " "
95 PSD 9.5 mpg 17 dollars " " " " " "

A gallon of regular gas is 3.63 a gallon of diesel is 4.10

Back when I had the 88 which was about 4-5 years ago the truck then cost me 12 dollars per hour to run when gas was cheap when fuel used to be 2.54 a gallon or 68.9 cents a litre now its 98.9 cents per litre.

The way the PSD is running now if I charge the truck out at 50 dollars per hour subract the fuel the truck is making a profit of 33 dollars per hour subract my wage the truck is making 13 dollars per hour.

Back when I had the 88 I used to charge 35 dollars per hour truck used make 23 dollars after fuel take my wage at that time truck was making 8 bucks per hour.

So by far the cheapest truck to run was the IDI it burned less fuel it cost less to repair but it was the slowest truck I owned.

11-15-2005, 11:14 PM
When we ran '91 thru '97 F Super duty's, we were hard pressed to hit 11MPG. The last one we had/are trying to sell is/was an 02 with a 7.3 PSD, hard pressed to see 12MPG. Our 4500 series are getting 13-14, and 6500 series are pushing 13-14 loaded or empty.

Can't offer too much advice to better that, you have a low gear ration and an inefficient engine combo. What's weird is basically, the 6.9's were very close to the 7.3 naturally aspirated. Those would hit 15-17 easy, then the 7.3's came out and they were pigs.

Gravel Rat
11-16-2005, 12:04 AM
Oh well its something a person has to live with I guess it just makes it hard to use the truck for a daily driver.

I think I will just have to charge more for the truck the price of fuel really hasn't gone down much. I really don't know if a 1 ton truck with 4:10s will net me better mileage then I loose 3000lbs of payload capacity.

The piggiest truck I worked with is a F-550 that belongs to a building supply I used to work for. The truck is 7.3 PSD power auto that truck used to suck back allot of fuel. The truck weighs 9000lbs just with a flatdeck on it you load her up with 7000lbs of wood and stomp on the throttle you can see the gauge drop and you can hear the fuel tank colaspsing from the suction :dizzy:

Its amazing how much weight I put on the 550 I put quite a few loads to make it gross past the gvw :blob1:

Actually there really isn't big money in trucking I need the truck to do the clean up work and other landscaping jobs I do.

11-16-2005, 12:49 AM
my f250 (96) gets 21-23 mpg around town not towing, best towing milage I've got was 19-20mpg towing 7000-8000lbs in 4wd last winter. this was city/freeway. Around town with my lawncare trailer which weighs under 3000 I still get 16-17mpg.

Change all fluids, put a better exhaust on it, a free flowing intake (cheap and easy to do yourself, I used a 45 degree bend of exhaust tubing and a k&n filter, that picked milage up i think 3-4 mpg), I've replaced a few sensors lately, cps, icp. I also tossed on the "10K" mod and that helps with towing.

my brother in laws 99 f350 gets 23-24 mpg around town, we just changed all the fluids and put the cold air intake on his.

I'm kind of worried about going to a brand new truck, I've heard from alot of guys that their brand new diesels get crappy mileage until they're broken in which can take a long time with a diesel.

Gravel Rat
11-16-2005, 02:33 AM
Its the terrian that gives me the bad mileage when your pulling grades 4-8% every day some grades are 10% trucks here work pretty hard climbing them. The straghtest stretch of road in most parts of the area range from 1/2 mile to mile.

I try to pull most of the hills in OD to keep the revs down pretty hard to do thou lots of shifting between 4th and OD. With my IDI and the truck grossing 14,000lbs I used to climb most of the hills in 3rd because the 5:13s only dropped down to second for a few minutes or till the truck could pull 3rd.

Its not uncommon to be pulling the hills at 30-40km/h (18-25 mph) usually no point in trying to get the truck to go any faster.

My old 80 F-350 grossing 13,000lbs used to pull the hills in second in some cases try double clutch it into first. The 351m didn't have much power I'am pretty sure the truck had a tall rear end gear ratio I never did check in the 4 years of owning the truck.

With my 88 F-450 grossing 16,000lbs I had to use 2nd gear the engine used to scream also burned lots of fuel too.

You learn how to climb the local hills by taking a run at the bottom I usually try get up enough speed for momentum. The P.O. is when I get some drag azz tourist in my way and I can't get a run at the hill.

The old IDI was good if you didn't let the rpms drop below 2000 if you did then your crawling. With the 5:13s you couldn't drop it to 4th too early or you will peg the rpms so I had to try hold it in OD long as I could before I dropped to 4th or I would loose speed.

It took me awhile to learn how to drive the IDI right as it was my first diesel light truck previous trucks were all gassers. I haven't had a good heavy load on the PSD so I'am not sure how good its going to pull. Grossing it to 15,000lbs and tackling a 10% grade will test the truck.

11-16-2005, 10:29 AM
"Its the terrian that gives me the bad mileage when your pulling grades 4-8% every day some grades are 10% trucks here work pretty hard climbing them. The straghtest stretch of road in most parts of the area range from 1/2 mile to mile."

That is exactly the reason why there are so many variables in milage. Funny thing, all milage testing is done in Michigan and Ohio, and last I checked, they both have fairly flat roadways and very few high wind conditions. So, you see those ridiculously off based milage reports pasted in the windows of your new ride.

Back to topic. That naturally aspirated 7.3 Cornpicker/Ford engine was and still is a pig. Strong durable engine, but pig engine.

Gravel Rat
11-16-2005, 03:16 PM
The IDI wasn't that bad it was better than what else was out there in that era the 6.2 Chev and 6.5 Chev were and still are turds and Dodge really doesn't build a decent work truck but did offer the Cummins in 89 at a whopping 160hp.

Ford and Chev pretty much dominate the 1 ton dually cab and chassis market gas or diesel.

11-26-2005, 07:44 PM
just wondering if the PSD's were turboed, or the naturally aspiriated version? should have some effect as to the fuel economy, thanx

Gravel Rat
11-26-2005, 09:51 PM
My truck is up to 13 mpg now I doubt I will see anymore than that.

The PSD that started in 94.5 all have turbo the 94 and prior engines (IDI) mainly came as naturally aspirated they did have a factory turbo for the 93-94 year.