I tow at 65(speed limit allowing). That is the bottom edge of the torque peak on my motor (1750rpm) and the motor likes it. It takes less boost to maintain the speed than at 60. Granted it increases the fuel mileage slightly (less than .5mpg) but the transmission downshifts a lot less decreasing wear. I'm not in a hurry just trying to take it easy on the drivetrain. Harley riders like to say "It's not the destination, it's the journey" I fully agree with that but pulling an RV it's 50-50, I like to enjoy both. My motto is "I'll be there when I get there, wherever there is"