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What kind of differences have you seen in fuel mileage with a programmer/chip installed on your Duramax.
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Predator: 1-2 mpg improvement, running 40hp & 65hp
Juice: basically the same as stock, running level 3 mostly
Juice: basically the same as stock, running level 3 mostly
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1,038 Posts
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.
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