I have a 2021 Ram 4X4 Big Horn, 6.4L, 4.1 AR, 6.4 bed, 2998 Payload, 4000 miles on the Odometer. On the highway I've been averaging around 13.5mpg, around town 10.5-11.5 based on my driving habits and level of frustration with the traffic. Pulling my 25' Airstream I get 9-10.5mpg depending on...