Finally got around to figuring out the mileage from a road trip (1138 miles) we just got back from. It was a treat not to be towing our tt this time. Went up through Montana, over to Washington, back down to Idaho. Fueled up five times differing driving condtions, most on two lane with 65-75 limits and alot of mountain passes with 25mph corners. We had a 14.8,14.37,12.3, 14.85 and 14.2 for mileage while keeping my eye on the tach. Looking back, the 12.3 mileage was a day that we were mostly in-town driving. Need to quit racking up the miles on our '05/6.0 though because we are up to 84,619....