So I was wondering about fuel milage. I'm getting about 10.5-11 in my 4x4 91 ext cab f250 NA 7.3 w the E4OD w 3:55 gearing... I've got a more aggressive tire but not a large tire.

Thoughts?

 

I know the tires are affecting it a bit, but I guess my what I'm asking would be, is this a fair mpg for what I have? It seems a little low to me but I was a teenager the last time I had one and it just wasn't important then haha.

 

I think your mileage could be better. Some claim 20, but 15 is more reasonable.

 

That's more what I was expecting/hoping for... We get 18 out of our PS and its got 900,000miles haha so I would hope the idi could do better than 11

 

when i bought mine i drove it home from atl to detroit got 19 mpg. 2wd 5 spd.

 

im sure i was getting 17mpg 7.3idi na e4od dully cclb i just did alot to it when i get it cruseing with thr turbo ill post what i get then also depends on driveing habbits as well like i saw my worst mpg just sitting in traffic my experiences in the past where 45-70 was green but lower or highter it sucked not really sure why but never whent below 11mpg loaded
i also have a 90 idi turbo and 5 speed with 4x4 and 6.11 gears front and rear im lucky if it sees 8 lol

 

11s pretty good.....when towing for 3.55s you should be getting high teens at least, unloaded my 4.10s (7.3 turbo w E40D) gets around 15 (at least pre IP and injector swap)

 

I'm pretty tame when I comes to driving habits, at least these days I am. I believe something is off somewhere. I had a brake issue when I bought it but it is all resolved now (tho I am going to double check for any resistance) and the alignment is perfect straight as an arrow.

 

Well we haven't even gotten to loaded milage haha... I dread to see those numbers

 

if set up right it dose not change for me only by a few mpg by thats that truck then idk what its going to do now

 

11 seems way low! My 460 does that good of mileage!

Iv filled up my 7.3 n/a twice now:
16 mpg with prolly 3/4 highway miles
14.5 mpg with prolly 1/2 highway miles

Maybe you've got a bad injector? You can have a cylinder quit on ya and it wont knock and rock around but will be wayyy underpowered, thus gotta use more fuel to get you where your goin.

Or heres a 2nd thought: the worst gas mileage Iv ever got was 8 in my 460. Not because its a 460 but because it had a gas leak. Maybe your leaking some fuel

 

No fuel leak but the injector is a possibility. I've been slowly renewing this truck since purchase and actually injectors and pump rebuild were next on my list... Bc of a slight under power feeling.

 

I was about to ask how many miles? Have the IP and sticks been done? What kind of shape is the tranny in, does it slip, does the TC lockup?

I have 35s 3.55s and zf, it averaged 18.2 over 7 tanks of fuel. Nothing special, i drove the hell out of it. Even loaded it was hard to get under 15. However i ran a bunch of #1 in it and wiped the pump, its gotten steadily worse over about a year, now im gettin 12.8-13.2 and power is really suffering

 

Yesterday i went 200 miles on the the highway with my truck. Did 62mph and averaged 17.85mpg. Came back home towing a boat and was averaging 15mpg. Mind you my truck is 4.10 gears, turbi, sitting on 35s 4wd and a zf. I was really happy witg my mileage.
Rob

 

The ip nor the injectors have been into (that I can tell) and the miles are a mystery but I'm estimating 200,000