Boys, boys, boys, boys, let the fight begin. I've had diesels since the late 80's but never had a dmax. All my trucks got better milage at low speed than on the interstate. I now have a 13 dodge with 3.42 and an auto on 32's and it gets 18 around town and 16 on the interstate. I'm assuming it takes more power to overcome air at 80 than 60. do the new fords get better milage on the interstate also?