Poor fuel mileage. What is everyone else getting

[Wilson7397]

I have a 97 F350 powerstroke, reg cab , auto trans, 4.10 gears, TS chip, intake, exhaust,203 thermostat, IDM mod, 305/70/16 tires, truck weighs 7000lbs empty, and I average 14 mpg. Is anyone else with 4.10s getting any better miledge? I have no lack of power and it tows great but the mpg is killing me. Its let driving a gas pick up that gets 10 mpg.

[351fifty]

i get 18-21 i have a 4x4 crew cab with 4.10's, check your fpr screen, fuel filter, could have some crappy injectors, what kind of mileage? i have 289k, i know it says exhaust, but do you have a down pipe as well?

[OnTheBio]

I have a 97 crew cab and when I bought it I was getting a little over 11mpg with 315's. I put new exhaust, 6337, a TS chip with generic tunes and got 4 mpgs, cleaned the fpr and replaced fuel filter, another 1.5 mpg. Had injectors rebuilt and installed new Bilsteins and got just shy of a 2 mpg gain. I'm pushing 17-18mpg now. Running 285's now as well. I usually keep it under 2k RPM's. I'm doing a front end rebuild to check for brake dragging and replace some other things then get it aligned as well. I'll post up any gains I get after that and there's still a few other things I want to do. I just made a 2000 mile trip and never saw about 17.6 for a short short time rarely going above 2k.

Out of curiosity, what's your speed at 2k rpm's? I'm sitting pretty at about 61mph and that's usually as fast as I like to go.

[glovemeister]

Lol that is just damn outstanding to be getting that MPG bud. I am in this boat and usually get around 15, but I've gotten as low as 10.8.

[OnTheBio]

From what I uderstand 17 is about average so I'm pretty impressed with that. I have a few things up my sleeve I so I'm hoping that within 1-2 months I'll be pushing about 22-24 MPG after everything is said and done. I'm hoping at least a 5 mpg gain still. All my tires are checked for pressure every couple days. I keep them solid at 65psi usually.

I'm still experimenting really. I'm not in a position to put one of the AFE caps on in the back quite yet or give up my 410's lol... Oh well...

Drive with the RPM gauge and have patience. Take it easy on the gas pedal and you'll maintaing a good MPG.

On my 2 week road trip I calculated for a while we were driving between 2500-3k and it dropped down to about 12 mpg for that time. Drive slow - support our troops - use less gas so we don't have to be dying for it anyways.

[glovemeister]

Lol my truck runs on diesel...

[351fifty]

they already pulled out of iraq lol, atleast no marines are there, and i keep between 2k and 2500, its the speed i like 70-75 mph all day, but i have to keep it around 2k-2100 rpm to get good mileage

[glovemeister]

Weird I prefer 60mph. Above that my truck is just sounding like its screaming.

[351fifty]

it has a hum around 71-74 mph, but above or below its good with me, i just hate moving slow, hell i like my mustang at 90 lol

[JSchuricht]

I have managed 19 with 265/75r16's and 4.10's. One day I hope to get my superduty near that figure.