When I tune my 05 Duramax with the 80HP tune, I gain around 7 to 8 miles better to the gallon. :lol: I went from 18mpg to 25mpg and thats driving 70 to 75mph. If I drive at 65mph I have seen as much as 28mpg. I love this tuner :D

I just installed my first predator on my 2007.5 Duramax LTZ and I'm ...