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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Last summer I took a couple kayaks on a camping trip for the first time. They were mounted on top of the truck cap. My mileage improved almost 2mpg. The cap itself affects mileage negligibly.