Poor Milage

[C.Shaffer]

Alright i know its been talked about a 1,000 times, but i cant figure anything out. I have a 2000 f250 7.3l reg cab long bed- Dp- tuner (run it on 120hp) cold air intake, straight exhaust, Aih delete, non ebv ped., x wheel, hpop crossover, 285/75/26 cooper discovers. and so on

I think my tanks 34 or 36 gal i only get like 400- 420 miles on it so i think im getting like 11- 12 all the time idk what the deal is i have tried my 80hp eco tune and still no luck i actually do better on the 120, and yes my tires are aired properly, please help me!!!!!!!

[ford diesel power]

Originally Posted by C.Shaffer

Alright i know its been talked about a 1,000 times, but i cant figure anything out. I have a 2000 f250 7.3l reg cab long bed- Dp- tuner (run it on 120hp) cold air intake, straight exhaust, Aih delete, non ebv ped., x wheel, hpop crossover, 285/75/26 cooper discovers. and so on

I think my tanks 34 or 36 gal i only get like 400- 420 miles on it so i think im getting like 11- 12 all the time idk what the deal is i have tried my 80hp eco tune and still no luck i actually do better on the 120, and yes my tires are aired properly, please help me!!!!!!!

how much air?
26 inch rims?

[ford diesel power]

it appears we have similar trucks with the same tire size. My truck gets 14.5 mpg city driving.

[C.Shaffer]

sorry 16 inch rims i think im running them around 50 psi

[ToMang07]

Originally Posted by C.Shaffer

Alright i know its been talked about a 1,000 times, but i cant figure anything out. I have a 2000 f250 7.3l reg cab long bed- Dp- tuner (run it on 120hp) cold air intake, straight exhaust, Aih delete, non ebv ped., x wheel, hpop crossover, 285/75/26 cooper discovers. and so on

I think my tanks 34 or 36 gal i only get like 400- 420 miles on it so i think im getting like 11- 12 all the time idk what the deal is i have tried my 80hp eco tune and still no luck i actually do better on the 120, and yes my tires are aired properly, please help me!!!!!!!

My question is HOW are you calculating your mileage? Sounds like you are just guessing based off your fuel needle.

You NEED to calculate based on gallons per mile:

Fill up tank all the way. Drive for 100-200 miles, fill up again, and divide miles/gallons. THAT is your mileage.

If you are doing it that way I apoligize....but...

[C.Shaffer]

Every time i fill up im just taking my miles devided by the amount of gal it took to fill it up

[thebierguy]

Make sure you are filling to the same levelevery time too. These tanks like to foam up the fuel and sometimes you can get 4-5 extra gallons after it clicks off the first time if you take your time.

As far as MPG, try keeping off the skinny pedal for 100-200 miles. Use the throttle very lightly, use cruise, don't go over 2000 RPM, then refill and see if your MPG improves. You are using the 120 tune so it might be hard not to hammer on it.

Also, don't idle a lot. Idling really cuts down on the MPG in my experience. In the morning, I get in and start it and go.

Edit: I see you are running 285's. If I am thinking correct, the stock tire for the truck are 265's. If this is the case, you are traveling more miles per tank than what the odometer says. For example, with my truck, I am running 285's and I see about a 0.5 mpg improvement of actual miles traveled over miles traveled on the odometer.

Just my

[Zaairman]

Your longbed truck has a 38 gallon tank. Just FYI. And everybody in here has said everything that I would, so....

[EAD-fishing]

Originally Posted by thebierguy

Edit: I see you are running 285's. If I am thinking correct, the stock tire for the truck are 265's. If this is the case, you are traveling more miles per tank than what the odometer says. For example, with my truck, I am running 285's and I see about a 0.5 mpg improvement of actual miles traveled over miles traveled on the odometer.

285/265 refers to the width of the tire......not the height.

[thebierguy]

They 285/75/16's (32.8 in) have a different diameter than 265/75/16's (31.6 in)