Ok I'm sure there is a lot of different opinions on this....
My buddy has an 07 Dodge cummins 5.9L and is wanting better mileage! Not something with crazy horsepower cause he doesn't want to screw the trans!!! Or if its better maybe a "big" chip/programmer just set on a lower setting?

WHICH ONE SHOULD HE BUY??

Thanks in advance guys!!!!

 

Well I guess there is very few opinions on this!!! No replies yet!!!

Anyone????

 

hmm ya i was wonderin what the best milage people have seen out of a 6speed 4:10 geared dually? so far i have figured rufly 15mpg and i have 35" tires and its stock with air aid intake and thats about it

 

If you're wanting Mileage and mileage only.....Grab a diablosport predator they will give you the most MPG.....However Smarty will give mileage too, and it will run cooler than any other tuner on the market for us....

 

im getting a smarty for my 07 i wonder if Il be any smarter

 

....I am gonna agree with you...that was a SMART buy....those things are pretty sick and dude the versatility on those things is just unreal...