We pulled across Texas where the speed limit was 80 and most were doing 90. I just do not feel comfortable pulling the TV /RV combo at 80 mph. I would run 80 all day solo and care not about the MPG but not with the 3400 back there. I many cases in would exceed the tire rating by a lot and I don't think these RV's were ever designed to run that fast.
The thing is Dave indicates that his truck get the same MPG at 60 or 80..that is trouble. and Ford should be able to correct that.
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