Hi everyone! i was reading an ad in a local newspaper claiming if i did this computer tuning to my truck it would increase power and mileage 10% - 30%. I am wondering if any of you have done this and what were your results? I am thinking not so much on the power side(although every bone in my body wants this) but the way gas prices have been to save even 10% would help me out over a season. My truck is an 01 silverado 2500hd.