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MY 2001 H.D.
Our daily drivers are a 2001 GMC HD 6.0 and a 2001 Yukon 5.3. The HD has a hypertech power programer installed. Will a tune from Allen make a big differance in power or gas mileage? How about driveability? Neither one get good mileage now. The truck is lifted with 36" tires and gets about 10 mpg. The Yukon is stock except for the 22" wheels and only gets about 12mpg.
yeah, youll notice a difference, I had a PP3 and thought it was cool till i got a custom tune. Now i wouldnt even think of any thing else! also allen gives free retunes so if you change something or want some thing different you can change. With proper tuning your motor will be at peak effeciency and as long as you drive wisely MPG will not suffer. When my truck was stock i saw 2 + MPG with A good tune, C.A.I, Exhaust mods.
A programmer is nothing compared to a custom tune. :thumb: