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I have a 32 footer with the Ford V10 and get pretty consistent 7.2 to 7.4 mpg towing a car behind. Not sure what the mileage would be with out the tow.
7-8 mpg would be typical for a Class A gas engine, but the weight of your foot on the go-pedal will have a lot to do with it. Stay under 65 on the open highway and avoid accelerating as much as possible.