TFL Truck highway MPG test 2500 Cummins

65mph? I drive faster than that through the car wash! Real world is running 75~mph with traffic. I get 47mpg in our Prius Xsp running 75~mph if we're not towing anything. Last weekend we were going south on I-75 near Gainseville with cruise set on 72mph and a Cummins powered dually with a living quarter gooseneck horse trailer passed us. All four of my Cummins Rams gave 19mpg interstate running with traffic. Still not bad.