I know this has been asked before but I want to do it one more time. I'm fixing to pull the trigger on a 2008 Chevy 2500 4x4 with the 6.0. It has 3:73 gears and the 6spd auto. What kind of mileage can I expect out of this truck? Not worried about towing so much because I know the mileage will suck. More worried about highway, I have a 50 mile drive to work.