Two and a half weeks traveling across the country from PA to UT and back - sad to say with a 2" lift and tire on top I averaged 8.9 MPG. If I was inclined to drive at more modest speeds, I could goose another 1-2 MPG out of the set up. Posted speeds were usually 65-70 with long, straight and untrafficked (safe) stretches, so hard to force yourself to go slow. (When not towing, my truck yields 12.0 MPG.) Was able to travel at 70-80 mph without any sway issues - obviously the faster you go the lower your safety factor vis a vis braking and emergency maneuvering, but that is the same whether towing or not. I won't go into how low the MPG rating was in 4LO offroad, but it was "less". A great experience though, so no complaints.
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