05 RC - 12 city, 17 highway at 70mph
06 QC - 9 city, 13 highway at 70mph, 10 towing 7000 pounds at 70mph....
Best mileage in the RC was just over 18, cold temps, tail wind, baby on throttle.....with the QC, got 15mpg on a 2 hour trip, cold temps, tail wind....
By far most fun truck in the world.....it's a blast.....but it ain't cheap....as a daily driver, it will eat your lunch if you are on a budget.....