I have a '17 Big Horn ED 4x4 with 3.55 gears. 20K miles to date and have towed my 25' TT (5000# dry) over 10,000 miles. Ave mpg towing is 13.8. Only downer is towing into heavy wind. Mileage really takes a beating. Plenty of power. So far 2 trips to dealership for oil changes and recalls...