[Eddie Haskell]

What kind of differences have you seen in fuel mileage with a programmer/chip installed on your Duramax.

 

[ZFMax]

Predator: 1-2 mpg improvement, running 40hp & 65hp
Juice: basically the same as stock, running level 3 mostly

 

[DMAX2DAMAX]

Quadzilla 70HP tune about +1-2mpg. I'm now running 110HP will post result after a tank or two. Then same with 135 & 165 if it doesn't limp or zing the alli.