How could this be?
I usually get around 13 mpg when pulling my 33ft,11000lb loaded, fifth wheel. That, of course, is on flat ground doing 60 with no headwind. My truck is a 2018 Ram 2500, diesel with a 373 axle rating. ...
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I had the opposit effect when I traded in my 7800 lb 30 foot trailer for a 15000lb 40 foot 5th wheel with my short box diesel. with the trailer there are two huge drag plains one behind the truck and one behind the fith wheel. I would get about 12mpg cdn towing that, when I got the 5th wheel because of how close the front sat to the back of the truck cab and the shape it almost eliminated the one low pressure zone and my milage went up to 15mpg (cdn) when I bought a new truck that is now a long box my milage decreased a bit to about 13.5 mpg. aerodynamics plays a huge role in fuel economy once you get over 40mph, and the faster you go the more differene it makes.
Steve
Steve