Motorhome Travel
RV Miles Per Gallon Calculator
The RV Miles Per Gallon Calculator helps motorhome owners track and budget their fuel economy. RVs are large, heavy, and far from aerodynamic, so their fuel economy is much lower than a passenger car’s — typically in the 6 to 20 MPG range. Knowing your real number is essential for planning fuel stops and estimating the cost of a long trip.
Enter the miles driven and the gallons used to get your RV’s MPG. Add an optional gas price and the calculator also shows your cost per mile, plus the metric equivalent L/100km for international travel or comparison. The math is simple — MPG is miles ÷ gallons — but tracking it consistently reveals a lot about your rig.
Fuel economy varies widely by class. Big Class A diesel pushers often land around 6–10 MPG, mid-size Class C motorhomes around 10–15 MPG, and compact Class B camper vans can reach 18–25 MPG. Towing a trailer with a truck or SUV also drags your tow vehicle’s MPG down noticeably. The good news is that driving habits make a real difference: holding a steady 55–60 mph, keeping tires inflated, traveling with empty waste and partial water tanks, and staying on top of maintenance can all add up to meaningful savings over thousands of road-trip miles. Pair this with our trip cost and fuel cost calculators to plan your whole journey.
How to Use
- Enter the miles driven since your last fill-up.
- Enter the gallons of fuel used.
- Optionally enter the gas price to get cost per mile.
- Click Calculate RV MPG (or press Enter).
- Review your MPG, cost per mile, and L/100km.
Related tools: MPG Calculator, Trip Cost Calculator, Boat MPG Calculator.
Got Questions?
RV MPG Calculator FAQ
Divide the miles driven by the gallons of fuel used. For example, 250 miles on 25 gallons = 10 MPG. RVs and motorhomes typically range from 6 to 20 MPG depending on class and size.
Class A motorhomes often get 6–10 MPG, Class C around 10–15 MPG, and smaller Class B camper vans 18–25 MPG. Towing a travel trailer also lowers your tow vehicle’s MPG significantly.
RVs are heavy and have a large frontal area, creating high aerodynamic drag. Weight, wind resistance, and big engines all combine to push fuel consumption well above that of a typical car.
Drive at a steady 55–60 mph, keep tires properly inflated, reduce weight and water tank levels when possible, avoid roof-top clutter, and keep up with engine maintenance.
Yes. The MPG calculation is the same regardless of fuel type. Just enter the gallons of diesel used and your gas (or diesel) price for accurate cost figures.