I have a 2000 coachman mirada 28QB and tow a 28' trailer. My car weighs around 2990 w/o driver and ballest. I carry a small quad, 10 x 20 ez up, spare trans, 3 spare converters, 2 center sections, small air compressor, 5-gallon air tank, 300' of electric cord, 15-gallons of race gas, spare tire, 36" fan, 2 small tables, jack, 4 jack stands, 15-gallons of water, 10-gallon cooler, snap-on tool box on top of l-shaped bench, spare fuel pumps, gaskets, spare valve train parts and electronics, 20 qts of trans fluid, 5-gallons of oil blah blah blah. I tow at 67mph on cruise and get exactly 6.6 mpg with a k&n air cleaner. It tows better then my 2000 gmc crew cab dually (gas 454) did. Takes hills better and that got around 7.5 @ 70 mph.