I think an overlooked item regarding discussions on mileage while towing, is........what does it do without towing, on highway? E.G., what percentage is your towing mileage of your normal mileage? If it's 25%, that's one thing.......if it's 75%, that's another. I guess that's all a way of saying 'How adversely does towing affect your non-towing mileage'. I suspect some vehicles are way worse/better than others.
"Next to prayer, fishing is the most personal relationship of man"Calvin Coolidge
"American by Birth, Southern by the Grace of God"Lewis Grizzard
2016 GMC Denali 3500Dually--2017 CC 36CKTS