Originally Posted by 1Tuff6.7
I know we're not comparing apples to apples here but I know the best way to get mileage out of my truck is to run it on the hot tune (175hp) and keep my foot out of it. The general idea behind it is that the engine isn't having to work as hard to move the truck at a given speed.
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This is why my truck had the best mpg on the 91+ Performance Tune.