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Reading Time: 7 minutesLast Updated on April 26, 2026 by Paul Clayton
Table of Contents
10 Easy Ways To Conserve Fuel and Improve RVs Mileage
Key Takeaways
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- Weight and Size Matter: The choice of RV is the most significant factor in fuel economy. Lighter, more compact options like Class B motorhomes or smaller travel trailers inherently provide better MPG than large Class A diesel pushers.
- The “Sweet Spot” Speed: Driving between 55 and 60 mph is generally the most fuel-efficient range for RVs. At this speed, the transmission is usually in its highest gear, and the torque converter is locked, minimizing fuel waste.
- Aerodynamics and Streamlining: RVs are not aerodynamic by nature. Removing unnecessary roof mods, smoothing exterior trim, and avoiding bulky add-ons like bullbars reduces parasitic drag and lightens the engine’s workload.
- Proactive Maintenance: Keeping up with oil changes, spark plug replacements, and engine fluid levels is essential. Additionally, maintaining the manufacturer-recommended tire pressure (e.g., 30 psi) reduces rolling resistance and improves safety.
- Smart Driving Habits: * Maintain Inertia: Minimize hard braking and “jackrabbit” starts.
- Anticipate Traffic: Adjust speed to catch green lights and leave enough space to use engine braking rather than physical brakes.
- Cruise Control: Use the highest gear to keep RPMs low once at cruising speed.
- Diesel Advantage: Diesel engines typically deliver higher torque and better MPG for heavy loads than gasoline engines, making them a better choice for those prioritizing efficiency in larger rigs.
- Planning and Tools: Use apps like GasBuddy to find cheaper fuel across state lines and Google Maps to find the most efficient routes. Joining loyalty programs like Good Sam can also provide consistent per-gallon discounts.
The best thing about RV life is the freedom to explore and travel to new places. But RVs are, unfortunately, not the most fuel-efficient vehicles. I mean, at 10-15mpg, the cost of gas seems astronomical and could quickly rack up.
Fortunately, the high gas costs aren’t part of the RVing path. There are several ways to improve your RV gas mileage.
Here are the top 10 ways to improve your RVs gas mileage:
10 Ways to Improve Your RV’s Gas Mileage
1) Choice of RV Matters-Weight
The consensus among many RVers is that the lighter the camper, the more fuel-efficient; it’s really that simple.
So, between the option of a larger class A diesel pusher and a smaller, lighter class B RV, I’d go for the class B as it provides the greatest potential average MPG. In short, if you’re looking to save on fuel, get the lightest one you can; this even goes for the travel trailer.
Of course, the lightest options are usually the smallest and may feel claustrophobic. The more comfort and headroom, the more fuel usage. It’s what it is.
2) Consider a Diesel Engine
If fuel efficiency is your primary concern, then diesel is your best bet. Generally, diesel engines have higher torque and better MPG. It’s why most larger tractor-trailers are diesel-powered.
The tough part is finding an affordable diesel truck, but sites like Autotrader are handy.
3) RV Maintenance
Staying on top of your RV’s maintenance is key to extending its gas mileage. Changing your oil, replacing the spark plugs, and generally keeping your RV in top shape are sure ways to increase fuel usage.
In fact, without adequate engine fluids and maintenance, using any of the ways listed will lead to decreased fuel efficiency.
4) Slow Down
The biggest thing you can do to reduce your RV’s gas consumption is to slow down. The slower you drive, the better your mileage will be. On the other hand, acceleration uses more fuel than any other action, so you should make a jackrabbit start.
Most RVs have a sweet spot of 55-60 mph max, where you get the best fuel returns. The transmission is usually in the highest gear at this speed, and the torque converter is usually locked up.
5) Remove Unnecessary Mods and Streamline your RV
Most RVs have the aerodynamics of a brick; therefore, when strapping belongings, it’s best to eliminate all pockets and material that the wind can catch.
Remember, every bit of stuff on your roof or the exterior of your RV acts as a buffer against the wind, causing your RV engine to work harder to maintain speed.
Adding unnecessary mods to your RV also adds unnecessary weight. More weight equates to more power for acceleration, which in turn means more fuel. The bullbars are the worst, as they unnecessarily increase your RV’s mass, create parasitic drag, and may pose a safety risk in an accident.
So, help yourself out, and smooth out what’s on the roof. Also, remove unnecessary mods for more fuel efficiency.
6) Monitor Tire Pressure
I can’t emphasize the importance of monitoring your RV tire pressure. You must properly 
inflate your tire pressure according to the manufacturer’s specifications. If the OEM says 30 psi, use only that; underinflating or overinflating your tires may give you poor mileage.
On the other hand, maintaining correct tire pressure improves fuel economy and extends tire lifespan.
You must also keep the wheel perfectly balanced and aligned.
7) Smart Gas Purchase Decisions
Although how and where you purchase gas doesn’t strictly influence your RV mileage, it may affect your travel budget.
Sometimes it makes sense to shop for gas because fuel costs vary widely between states. An app like GasBuddy is handy and will help you optimize your stops to get the best fuel deal along your route.
You could also cut your RV fuel consumption by signing up for a fuel station loyalty membership. Membership cards like Good Sam regularly offer fuel discounts at different fuel stations.
Finally, you must map your route to avoid having to search for gas. Know your RV’s fuel tank capacity. The rate of consumption and the distance between available filling stations. This way, it’s easy to estimate how much you’ll spend and avoid the unpleasant surprises of high gas prices.
You could even take your planning a step further by using Google Maps or Waze to identify the most efficient RV route based on the current traffic conditions.
8) Engine Modifications
If you have the skills and resources, you can modify your RV’s engine to achieve some fuel savings. For example, modifying the computer or adding an extra cold-air intake may help with fuel savings.
However, this is not a simple DIY project, and I suggest you seek the help of a trusted professional. Be aware it may also void your insurance coverage.
9) Consider Carpooling
Many other campers are also trying to save fuel, so carpooling is an option. If you’re at a campsite and need to run an errand in town, try asking to see if anyone is heading that way so you can hop a ride. You could also offer rides to other campers, so everyone saves on fuel.
10) Smart Driving
Driving an RV isn’t much different from driving a vehicle. The mechanical principles are similar, and here are ways to optimize your RV’s fuel efficiency, just as you would in a regular vehicle:
- Inertia is your friend: When driving, accelerate quickly to your desired speed, then shift to the highest gear to keep the revs low. Ensure you also adjust your speeds to “catch” traffic lights. The idea is to never use the brakes and to keep your RV’s inertia moving.
- Always leave some space between you and the car ahead so your engine brakes to slow your RV when they brake.
- Always set your eyes ahead, and change lanes accordingly to avoid hard braking or slowing.
- Coast if it’s possible, but with your gears engaged
- Use your AC wisely
Don’t Be Deluded
Finally, be aware that people’s MPG anecdotes can be way off. Don’t compete or get too obsessed with numbers. Far too many RVers will rely on their RVs’ computers.
Be realistic about your consumption. For example, if you have a medium-sized trailer, 3,000 lbs, don’t expect to break 15 mpg very often. In most cases, you’ll be closer to 10 MPG.
Frequently Asked Questions
Q: What is the single most effective way to save fuel while driving an RV?
The most impactful change you can make is simply slowing down. Most RVs achieve their best fuel economy between 55 and 60 mph. Driving at this speed keeps the transmission in its highest gear and the torque converter locked, significantly reducing consumption compared to driving at 70+ mph.
Q: Does tire pressure really affect my gas mileage?
Yes, significantly. Underinflated tires increase rolling resistance, forcing your engine to work harder and burn more fuel. To optimize MPG and extend the life of your tires, always maintain the exact PSI specified by your RV’s manufacturer.
Q: Why should I avoid adding “bullbars” or large roof racks to my RV?
RVs already have poor aerodynamics, and adding bulky external modifications creates “parasitic drag.” These items act like a wind buffer, requiring more engine power to maintain speed. Additionally, they add unnecessary weight, which further decreases fuel efficiency during acceleration.
Q: Is a diesel engine always better for fuel economy?
Generally, yes. Diesel engines produce higher torque and are more thermally efficient than gasoline engines, which usually results in better MPG, especially in larger Class A or heavy-towing setups. However, the initial cost of a diesel rig is often higher, so it’s important to balance the fuel savings against the purchase price.
Q: How can I use “inertia” to save money at the pump?
Smart driving is about keeping the vehicle moving. By looking far ahead to anticipate traffic lights and leaving space between you and the car in front, you can avoid hard braking. Every time you use the brakes, you lose the energy it took to get the RV moving; by “coasting” and maintaining momentum, you minimize the need for fuel-heavy re-acceleration.
Final Thoughts
Overall, I recommend you determine what you want to do with your RV before worrying about achieving the best MPG from your setup.
While RVs will never match the fuel efficiency of a standard passenger car, owners can significantly reduce their travel costs through a combination of mechanical maintenance and behavioral changes. By slowing down, shedding unnecessary weight, and utilizing modern route-planning tools, the dream of affordable long-distance travel remains accessible. Ultimately, being realistic about your rig’s capabilities and avoiding obsessing over anecdotal MPG numbers lets you focus on the freedom of the road rather than the cost at the pump.
And remember, unless you’re living in an RV full-time, RVing is a more luxurious experience, and you’ll have to spend. But it’s worth it!
