Finding the best fuel mileage RV is about traveling farther, staying flexible, and spending more time outdoors instead of at the pump. For vanlifers and road-trippers, fuel efficiency shapes where you go and how long you stay. At The Vansmith, we’ve spent years exploring what makes an RV with good MPG practical, comfortable, and ready for real adventures.
Which RVs Get the Best Fuel Mileage?
Fuel economy varies widely across RV types. Size, weight, and drivetrain all matter. Smaller platforms consistently outperform large motorhomes when it comes to MPG, especially on long highway routes through the Rockies or the desert Southwest.
If fuel efficiency is a priority, camper vans and compact motorhomes are the clear leaders.
Class B RVs (Camper Vans) — Best Overall Fuel Efficiency
Class B RVs are widely considered the RV with the best gas mileage. Built on van platforms, they are lighter, more aerodynamic, and easier to drive than larger RVs. Most average 13–22 MPG, depending on engine type and driving conditions.
These vans balance efficiency with livability, making them ideal for long road trips, weekend escapes, and extended travel.
Top Fuel-Efficient Class B Models
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Winnebago Travato 59G
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Roadtrek Sprinter RS Adventurous
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Airstream Interstate Grand Tour
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Winnebago Rialta
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Roadtrek CS
Each of these models is known for steady highway MPG and compact layouts that support everyday travel.
Why Choose Class B?
Class B vans reflect two Vansmith principles: innovative design and durable craftsmanship. Thoughtful layouts reduce wasted space, while lighter materials improve efficiency without sacrificing comfort.
Benefits include:
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Easier city and mountain driving
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Better fuel range per tank
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Lower operating costs over time
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More access to campgrounds and trailheads
For travelers who value movement and flexibility, this is often the best fuel mileage RV category overall.
Class C RVs — Mid-Range Fuel Economy
Class C motorhomes sit between camper vans and large motorhomes. They offer more interior space, but that added weight impacts MPG. Most achieve 14–18 MPG, depending on length and engine choice.
Popular fuel-conscious Class C options include:
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Itasca Navion
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Winnebago View
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Fleetwood Pulse
These rigs suit travelers who want more room but still need an RV with good gas mileage for longer routes.
Class A RVs — Spacious but Fuel-Heavy
Class A motorhomes prioritize interior space and onboard amenities. However, their size and weight reduce efficiency. Most American petrol motorhomes in this class average 6–10 MPG.
While comfortable for long stays, they are not ideal if fuel savings and maneuverability are top concerns.
Diesel vs. Gas Engines
Diesel Engines
Diesel platforms often deliver better highway MPG and stronger torque. They perform well on long climbs and loaded travel days, especially in mountainous regions.
Gasoline Engines
Gas engines usually cost less upfront and are easier to service. However, they typically offer lower MPG compared to diesel options in similar RV classes.
Factors Influencing Fuel Efficiency
Several elements affect how efficiently an RV performs on the road.
Size and Weight
Heavier rigs consume more fuel. Compact vans consistently outperform larger motorhomes.
Engine Type
Diesel engines tend to provide better efficiency under load, while gas engines suit lighter platforms.
Chassis
Modern van chassis are designed for efficiency and stability, improving MPG across long distances.
Driving Style
Smooth acceleration, steady speeds, and lighter loads can significantly improve fuel use.
Tips to Improve Your RV Fuel Mileage
Small adjustments can make a noticeable difference over time.
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Maintain steady highway speeds
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Keep tires properly inflated
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Reduce unnecessary gear weight
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Stay current on engine servicing
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Plan routes with fewer steep climbs when possible
These habits help any RV with good MPG perform at its best.
Designed for Efficient Adventure
At The Vansmith, fuel efficiency aligns naturally with sustainability and personalized support. Our vans use responsibly sourced materials like birch and bamboo, paired with smart layouts that reduce weight and improve everyday usability. Every detail is shaped by real-world travel experience across Colorado and beyond.
Efficient vans don’t limit adventure. They extend it.
Final Takeaway
If fuel efficiency matters, Class B camper vans remain the best fuel mileage RV choice for most travelers. They combine smart design, reliable performance, and real-world practicality. For those seeking balance between comfort and efficiency, they continue to set the standard for modern van travel.
Frequently Asked Questions
What is the best fuel mileage RV available today?
The best fuel mileage RV is typically a Class B camper van. These vans are lighter and more aerodynamic than larger motorhomes and often average around 13–22 MPG, depending on driving conditions and engine type.
Which RV has the best gas mileage for long road trips?
A Class B camper van is considered the RV with the best gas mileage for long-distance travel. Its compact size helps reduce fuel consumption while still offering essential living features for extended trips.
Is a Class B or Class C RV more fuel efficient?
A Class B RV is more fuel efficient than a Class C. Class B vans usually deliver better MPG, while Class C motorhomes average 14–18 MPG due to their larger size and added weight.
Are diesel RVs more fuel-efficient than gas RVs?
In many cases, yes. Diesel-powered RVs often achieve slightly better highway MPG and perform more efficiently under load. However, fuel economy still depends heavily on the RV’s size, weight, and driving style.
What MPG is considered good for an RV?
An RV with good MPG typically achieves:
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13+ MPG for Class B camper vans
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14–18 MPG for efficient Class C motorhomes
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6–10 MPG for most American petrol motorhomes
Smaller RVs generally fall on the higher end of this range.
