Ive had my SD F-250 XLT crew cab off road 4X4 V-10 with towing and camper package for a while now and can honestly say it has been an excellent truck and a pleasure to drive. 12 MPG(at 85-90) on the highway and 14+ in town if not in the throttle all the time but I have 4.30 gears front/back in mine so my milage will be down a bit compared to taller gears. I may be giving my truck back since I was laid off so I will be taking the Super Chip(30HP and 50ft/lb torque increase), open conical gauze air cleaner with sealed box enclosure, and spiral bore throttle body spacer which did improve my milage by over 2MPG and a noticable increase in part throttle torque. I will be taking these off to sell. If interrested, let me know.