A little better mileage...?

[Big R]

a buddy of mine has a 99 dodge dually thats gettin around 10-12MPG... He has stock almost everything, it has a van aaken module, which im not familiar with at all, and 3.55 gears. I have a 99 dually myself, but at the time it had a 9" lift and 37's and i was still gettin between 13-14. I realize maybe a chip or something would help but i guess what im asking is which one? he wants better mileage over anything. I've always just wanted the power, wantin good mileage is new too me. Oh and i guess i should mention he doesnt "put his foot into it too much" Thanks in advance for some help for him

 

[Kick Start]

Check fuel filter and air filter first. Check the intercooler boots aswell

 

[haz-mat19]

That seems low, is that hand calculated or overhead? And the above is a good place to start. Is that in town only? I got close to 20 and a high of 22 on the highway stock.Try unplugging the box to see if that helps. An intake and exhaust will help some, but like said check the filters and boots.

 

[silverram323]

Sounds like he has my problem. Sucks fuel like its free. 9-14 towing-freeway.

 

[Big R]

Excellent thanks for the help, after i posted this i thought about the fuel filter but everything else is new ideas, i thought those numbers were pretty low myself, and thats hand calculated he says, if we could go off that then i'd be getting 31.4MPG :shake: