We normally get ~17 MPG with my 2005 Expedition on the interstate...I took a little hit when I put more aggressive tires on it. I have the 300 hp V-8 and 3.73 gears.
With our ~4,500# loaded Hybrid, we got a little more than 10 MPG.
With our ~6,500# loaded Ameri-Lite 255BH, we get ~9 MPG.
With my 20' dovetail (open) utility trailer loaded with all my tractor stuff (~6,000# loaded), I get ~12.5 MPG.
Weight does matter, especially up the hills. But most of your "hit" is going to be, as others have said, pulling the barn through the wind.
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