Most Efficient .5 Ton While Towing

VernDiesel wrote:
...As mentioned Trailer Life magazine averaged 14.77 mpg useing the 3.0 diesel with a similar trailer & weight but I’ll bet at 65. My Ram ED (tuned) would have averaged in the 15s with that trailer/weight but at 65. Fuelie is a good overall comparison source. Not sure what I would have lost to dragging it at 70.

The difference between 70mph and 65mph is 9% less efficiency. While it will save you 32 minutes over a 500 mile drive it will cost -1.2mpg.