Welcome to the forum!
Our previous 33' coach with V-10 averaged about 7.5 mpg, towing a small car. Probably the same F-53 chassis and engine you have. Keep a close eye on the air filter and the tire pressure, both can lower mpg. I would kick the cruise control off ahead of even small hills, to prevent the gas sucking downshift. (Discussed in a previous thread on this forum.)
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