We have a 1995 F350 dually power stroke diesel with a 410 rear end, banks kit and air bags. We had a 30 ft. Hitchhiker II with 15 inch wheels and now a 2004 3670 with 16 inch wheels. We got 10-12 mpg pulling the Hitchhiker and the same pulling the bigger/heavier Montana. Speed is usually around 65. Hope this helps.
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