'02 7.3L-12'' on 40s

[roostme]

Found a 7.3L in great shape and for a great price. It has a 12" lift with 40" tires and I was wondering if anybody had any idea about what fuel economy I should expect out of this. It has a programmer chip but im not sure if it set up for increased fuel economy. I also tow a 22' bay boat sometimes. Should it pull this OK?

[Ryan Rønning]

Need more info. Type of tuner, gearing, auto or manual, stuff like that.

[roostme]

stock gearing and automatic. not sure of the tuner but i will find out

[Nor-CalF250]

10-13mpg's, but who cares about fuel milage, you are looking at a truck sittin on 40's. If you want mpg's go buy a prius

[trucktractorman]

Originally Posted by Nor-CalF250

10-13mpg's, but who cares about fuel milage, you are looking at a truck sittin on 40's. If you want mpg's go buy a prius

I know why he cares lol. Fuel is gonna keep goin up.

[roostme]

Ok it is a "Superchip" that is currently installed and the truck has stock gearing. Im just wondering what type of modifications i would need to make to maximize fuel economy? I can handle 10-13 mpg, but when i make the long hauls it would be nice to get a little better. And sorry NorCalF250, but you will never see me driving a Prius. If you do, then please run over me.

[Powersmoke73]

I dont think you will like towing with 3.73's and 40's. I know your trans wont. LOL

[roostme]

so if i regear to 4.30 would it help?

[Jason.]

4.56 gears for 40s, and get a TW 6pos programmer.

[Sting]

Mine has averaged around 12mpg not towing. Im a 8-10" lift with 40's and 4.88 gears.

All mods in sig.