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I just bought a little teardrop camping trailer, and it was amazing how much it impacted my gas mileage. I tow with a Subaru outback, and I went from low 20s (23/24 on highway) to mid teens. Almost ran out of gas on our first trip since it went so much faster than I expected!

I can't imagine that the F150 would be good for long haul trailers... just so much energy involved moving weight around.

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I've found towing mileage change was very dependent on the vehicle.

For example, I had a Dodge Durango which got pretty much 16mpg no matter what, whether driving empty or towing a car on a flatbed trailer at highway speeds, still 16mpg. Next vehicle was a used manual transmission BMW X5, got 22-24mpg empty on the highway, but just towing an empty flat trailer would drop that to 17mpg, and a car on it would be 16, and the same towing a small U-Hual box trailer, just instantly drop to 16. So, one was highly stable and the other highly variable with different weight/aero loads.

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