Operating 101
New member
Been looking for information and people with experience with the GMC 6.0L. I've gone from 9MPG on a good day to 15MPG. I operate oil and gas wells. And when I bought this truck i though it was a lemon with that mileage. But the more I looked into it. The more i found that we didnt leave the 9MPG mileage back in the 60's. UNREAL.... General Motors!!!! Got a K&N Cold Air Intake, Helix Power Tower Throttle Body Spacer and a Superchip(thinking i shouldve got bullydog maybe). Anyway got some major gains, but still looking for a little more. Hopefully there'll be some insite. I'm looking for high flow mufflers right now, we do pull trailers so if I can find something that will resemble stock. And we'll see just how far my wife will let me go :d