PowerStroke fuel mileage

[cbeard]

I have a 1997 F-350 4x4 straight cab pick-up truck. My fuel mileage when I bought the truck was somewhere around 15 mpg. I have upgraded to a Tymar intake and my fuel mileage seemed to drop. Later I had a new fuel pump installed and cleaned the fuel pressure regulator. Fuel mileage is somewhere around 10-12 mpg. Is this normal? The truck has 4:10 gears so im associating some of my mileage to the gearing. Any advise is appreciated.

[66Bronco]

If it's an automatic, you should be seeing 15-17 in town. Mine is 4x2 with 3.55s and a 5-speed and I get ~17 in town and ~23 on the interstate. 10-12 is a little low, but it's probably just dirty injectors or fuel filter.

[cbeard]

It is an automatic. Fuel filter was change about 2000 miles ago when I changed the fuel pump.

[Haydust]

Your mileage sounds pretty normal to me. It will vary alot depending how you drive. I have had all versions of a STOCK 7.3, 6.0 and 6.4 and they all get about 15-16 on the highway and 13-14 farming/choring. Everyone of them get 10 when pulling a trailer/hauling cows. I ran a chip for while on a 2000 F-250 I had and the power was awesome but it got the same MPG so I returned it to stock.
My nieghbors 7.3 got 19 all the time is what he told me, then I borrowed it one day and drove easy(not my truck) and went 200 miles and it got 16. Its amazing what the MPG is when you actually use a calculator.
I do have a 1996 psd f-350,crew cab, long bed 2wd, 5 speed, dually and it gets 10 MPG no matter if theres a tail wind or your pulling 15,000 pounds up a mountain.
With saying that all trucks are diferent. There is alot of good pointers on this site to help the mileage, mostly run stock, good tires with the proper PSI and keep your foot out of it.

best of luck

[jesilvas]

Doesn't sound right if you're doing normal general driving. Towing, that's good.
I have 4.10s, dually, more weight, and better mileage.
All trucks are different cause they aren't maintained like they should be and have different things go wrong.
You can have a boost leak, seized caliper slide pins, and many other things.

[351fifty]

check your fpr screen, fuel filter, oil, to really get the most out of these trucks i find synthetic oil, good tunes, air and exhaust will really help out as long as you can keep your foot out of the skinny peddal

[kramarj]

My dads truck is about the same setup and has a utility box on it and weighs probably 10k or a little more and we see 14-16 generally mix of city/highway driving. I drive everyday and drive it like a grandpa, but thats what we get.

[glovemeister]

I get 15.5 and weight in at around 8000 or maybe more? my flatbed weighs 1k by itself, winch bumper weighs 250 or so, plus I got a regular toolbox with stuff inside, plus my tool chest which I reckon weighs 100 or more. I then have stuff in the cab and 3 people generally. 97 f350 crew, 265 tires, 3.55 and 5spd. I'm not complaining one bit.

[sgg93]

I've got a 94 F350 4x4 5 speed. 3.55 Rear gears. Running too much tire (285/75 16), and it's been getting between 16.2 and 16.7 for the past 1500 miles. That's about 75% city. It gets kinda cold (20 or so in the mornings) and it idles a good bit. But I keep my foot out of it, and shift at 1500 RPM's. I've seen this truck do 18.5 city when it's warm out. Winter fuel doesn't help anybody's mileage.

[baderic03]

18mpg daily. 6ton load towing I get 13.5-14mpg