On average, Class A motorhomes and Class C motorhomes can get between 6 to 12 miles per gallon (MPG), while smaller Class B RVs can get between 15 to 20 MPG. Towable RVs, such as travel trailers and fifth-wheel trailers, don't have engines and rely on the towing vehicle for their fuel efficiency. To maximize your RV's fuel efficiency, you can use cruise control on the highway, avoid heavy acceleration and braking, and make sure the tires are properly inflated.
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As far as RVs are concerned, we have to drive it at a slow steady pace and that impacts the mileage factor.