My GMC, empty, weighs 6,100 pounds.
Loaded with motorcycles etc. I get a little over 10 mpg towing heavy. I have somewhere around 11,500 pounds rolling down the road.
It seems reasonable to me that any truck smaller than mine, carrying less cargo than me, should get noticeably better mileage than me. At least 15.
I estimate that the difference between towing fully loaded and driving empty is about 2 to 3 mpg. This is towing a TM. If I was towing an elkmont it may be a bit worse.
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