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I have an F-150 with essentially the exact same 3.5 liter twin turbo Ecoboost engine. I towed our Grand Design trailer with it. When not towing, I typically get 20 to 22 mpg. When towing I got 9 to 10 mpg. That tells me that it's more about the weight/mass you're moving than about just the engine.
If you load up a fairly large 10 ton box with the aerodynamics of a concrete block, your fuel efficiency will suck... there's just no way around that in today's world. Maybe in the future??
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