All stock ‘05 Tahoe. Will a MPG tune, make a difference in power? I’m content with the performance as it is, but would like to try to increase the mileage. I just don’t to lose power, if I go for a MPG tune. I know, if I wanted MPG, I should have bought a Honda! Will a HP tune, have a negative impact on mileage, will it be about the same, or wil it improve mileage? Thank you.