RV gas formula
RV fuel cost = trip miles / RV MPG x gas price
A 600-mile trip at 9 MPG uses about 66.7 gallons. At $3.80 per gallon, the fuel cost is about $253.33 before tolls, parking, or campground travel.
RV fuel budget
RV gas cost calculator
RV fuel budgets can swing quickly because MPG is lower and route conditions matter more. Estimate gallons, fuel cost, and a safer planning range before the trip.
Use a budget range
Low case: miles / 7 MPG x price
Base case: miles / 9 MPG x price
Better case: miles / 11 MPG x price
Why RV fuel estimates vary
Hills, speed, wind, towing, roof equipment, tire pressure, generator use, traffic, and stop frequency can all change real-world fuel use. A small MPG change matters more on a long RV trip than on a short commute.
For a long drive, calculate a conservative case first. Then add tolls, park entry fees, overnight parking, and extra side trips so the total travel budget is not just the highway fuel number.
Turn route conditions into an MPG adjustment
Start with a loaded MPG from recent trips, not an unloaded brochure figure. Use the route efficiency adjustment when sustained grades, strong wind, towing, roof equipment, or higher speed make the baseline too optimistic. The calculator reduces MPG by that percentage before estimating driving gallons.
Generator fuel is calculated separately from driving fuel because campground hookups, heat, and appliance use can change it without changing route miles. The final buffer is applied to the combined fuel estimate. Tolls, propane, campground fees, dump stations, and maintenance remain separate budget lines.