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The fact it won't shift into 6th is telling you it is working to pull it at those speeds. I think these modern V6s can pull something like that just fine, but they will need the lower gears and they will take a big MPG penalty. Still you wouldn't get much better, maybe worse with a V8 and the rest of the time your mpg will certainly suffer. Now I was able to squeak out 14 mpg with that Hi-Lo pictured but that was at 60 mph but it is lower than the roof of the SUV we towed it with. It is also 5000 pounds loaded but once your moving it's mostly aero. Going faster, 65 maybe 70, with some hills we only got in the 12's. The average v8 gas pickup, towing the average camper out there is getting probably 6-9 mpg so 10 ain't bad. Slow down and see what you get at 60 mph.
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