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What is the average gas mileage of a diesel RV?

Diesel RVs typically have better fuel efficiency than gasoline RVs. The average highway gas mileage for a diesel RV can range from 10-15 miles per gallon (mpg), while the average mpg of a diesel RV in the city is typically around 8-12 mpg. Factors such as the weight and size of the RV, type of engine, driving conditions, and fuel quality can affect the fuel efficiency of a diesel RV.