have a 2011 hemi 1500 myself, 17k now on it, towing in flat Florida, Alabama, Georgia at 70-75 mph and I think I average about 10.5-11 mpg. Recommend air bags in the rear coil springs to help with the squat you will have. I think the motor is plenty for towing a lsv ,as I have towed up over 80mph with no issue other than watching the gas gauge drop fast at that speed. Love the ride the truck has