Hey guys just wondering if someone could point me in the right direction to help me build a mileage tune for my buddies 2008 lmm. I have a lly so everything is a bit different than i'm used to.(Timimng base a,b,c high,med,low altitude and transient). We just wanted to keep stock power with a little more mileage. maybe a 20-40 hp mileage tune would be good too. If anyone has a tune they wouldn't mind sharing with me or if you could point me in the right direction would be very much appreciated. I'm just trying to help him out. He drives alot for work so any mpg increase would help out alot. i know we could purchase one but money is a bit tight. Thanks for your inputs.