How Much Extra Fuel Does a Small RV Burn on the Highway?

Published July 2026 | Fuel & Budgets

Small RVs are the most fuel-efficient rentals you can book, but highway miles still add up faster than most first-timers expect. The good news is that a few driving habits move the number more than the vehicle itself. Here's what to plan for.

Highway vs. Around Town

An RV is a brick on wheels, so it rewards steady speed. Most small rentals return their best mileage in the 60-65 mph band. Drop below that and the engine works harder than it needs to; push past 70 and wind drag grows steeply. The difference between 60 and 75 mph can easily be 2-4 mpg on the same rig.

Realistic MPG by Type

These are typical ranges renters see, not lab numbers:

Class B van conversions: about 14-20 mpg on the highway.
Small Class C (20-25 ft): about 8-12 mpg.
Pop-top / campervan: often at the top of the Class B range because of the lower profile.

Your actual result depends on payload, headwinds, and terrain. Mountain passes and a roof-loaded kayak both cost you.

A Quick Cost Example

At roughly 10 mpg and $3.50 per gallon, fuel runs about $0.35 per mile. A 500-mile highway day is around $175 in fuel; a 1,000-mile leg is about $350 before campgrounds or tolls. The RV Trip Budget Calculator builds this into a full trip estimate using your own route and dates.

How to Spend Less at the Pump

Cruise at 60-65 mph. The single biggest lever.
Check tire pressure at the rental pickup and top up if needed.
Pack light and keep heavy items low and centered.
Plan flatter routes when time allows; climbs burn extra fuel you don't recover on the way down.

None of this changes the trip, but together they can recover a few mpg and meaningfully lower the fuel line of your budget.

Frequently Asked Questions

Do small RVs get worse fuel economy on the highway than around town? Usually the opposite. A small RV does its best at a steady 60-65 mph. Below that you're lugging; above 70 mph wind drag takes over and mpg falls fast. Class B vans typically return 14-20 mpg; small Class C models land around 8-12 mpg.

How much does 500 highway miles cost in a small RV? At about 10 mpg and $3.50 per gallon, 500 miles uses roughly 50 gallons, or about $175 in fuel. A 1,000-mile trip doubles that to around $350 before campgrounds or tolls.

What actually lowers highway fuel cost in a rental RV? Keep speed near 60-65 mph, keep tires at the recommended pressure, and travel light. Each 5 mph over 65 can drop mileage by roughly 1-2 mpg, and a loaded roof or heavy cargo makes the drag worse.