i've only towed once with my 2012 1500 2wd,but i can tell you in hilly country it isn't going to get mpg for squat.i had it on tow/haul,lots of down and up shifting,finally just put it in 5th and was much better.and i'm not talking very big hills.this was hauling my 3100lb 63 on open 20ft car hauler.