Hi, Im new to this. I have always had Bryan at pcmforless do my tunes on my corvettes and camaros. I hooked my hptuner pro to my 2005 chevy 1500hd crewcab 4x4 6.0 liter to change the tire size on it. I put 285/75/16 tires on it. Other then that the truck is 100 percent stock. I would like a tune to get better gas mileage, and better shifts. I don't want to tear my tranny out either. I don't plan on racing the truck or dogging it all the time. Its pretty much a daily driver back and forth to work and occasionally pull my trailer with vette on it. I looked at a tune bluecreek posted for a 2006, but when I installed it on my truck it idled rough so I put the stock one back on it. If anyone can help with this I would very much appreciate it.