I had an older ('08-09) Ford F350 4x4 with toolboxes full of tools that on a good day downhill with a tail wind would get 8 mpg, towed a small tractor with a brush hog attached on a gooseneck trailer & got 6 mpg.
The newer ones have probably been tuned differently, but I still wouldn't be too hopeful of getting 10 mpg consistently.
The only class of rv you might do better than 10 mpg will be a class B with the diesel engine, but with those you'll have to step outside to change your mind.
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Fulltimed 10+ years
Sold '13 Thor Redwood 36 FB
Traded '13 GMC Denali DRW D/A
Replacement undetermined
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