I've also talked to this cat who was filling up at a Lives Truck Stop... pulling a 29-30' 5th wheel with a Ram 2500 manual.
He told me most diesel pullers lie big time on their fuel mileage while towing-lol
7-10mpgs isn't bad at all for a heavy load.
Ohh but wait....get a tow tune and holy crap the whole dynamics of the truck change-5* & SCT Tuner.
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