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How Get Better Gas Mileage – 14 Tips for your RV


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How Get Better Gas Mileage – 14 Tips for your RV

There’s not much we can do about rising gasoline prices. If we want to keep using our RV every weekend, we need to learn how to get better gas mileage so that we won’t empty our wallets by filling up the tank.

How to improve gas mileage, often starts by simply changing a few basic driving habits. These typically will bring about the biggest improvements to your fuel efficiency.

Following a change in yourself, making sure your RV (or car) is in perfect working order should see an improvement to your fuel economy.

Learn how to get better gas mileage in your Rig (or car)

  • How to save gas by careful driving.
  • What is Good Fuel Consumption?
  • How to improve fuel economy by reducing idling.
  • Driving with less aerodynamic drag and weight.
  • How to reduce fuel consumption through regular maintenance.
  • How to increase MPG by avoiding rush hour.

What is Good Fuel Economy?

What is good gas mileage for an RV? Typically most types of recreational vehicles will fall in a band from as low as 7 miles per gallon up to around 25 miles per gallon (highway). The worst offenders tend to be Class A motorhomes with Class B typically being the best.

  • Class A: 7-13 mpg avg.
  • Class B: 18-25 mpg avg.
  • Class C: 14-20 mpg avg.

To compare with what you can get in a regular car, around 30-35 mpg (highway) is pretty average for newer cars, with hybrids getting closer to 50-60 mpg. Although, if you own an older car, or a muscle car like a Dodge Challenger then you may not be getting more than 15-16 mpg highway.


What Will Improve Fuel Consumption?

No matter what you drive, there are several tips you can follow to refill your tank less often. 

Drive Slowly and Carefully

It’s commonly advised that driving slowly is a great way to get better fuel mileage. Excessive speeding drastically increases your wind resistance, which will result in increased fuel consumption.

But this doesn’t mean to drive dangerously slow, either. At low speeds, your automatic transmission car or RV shifts down to lower gears, which are not as fuel-efficient. The best way to drive is slowly and carefully in your top gear.

The posted speed limits on the highways are not only for your safety, but a good guideline to follow for efficient RV gas mileage. Keeping your speed around 55 miles per hour will give you the best RV mpg (miles per gallon).

Driving slowly also prevents many driving mistakes, which can not only be dangerous but can also waste time and gas. When a driver misses their exit or takes a wrong turn, it’s usually because they were speeding and not paying attention. Make sure to drive to the speed limit and study your directions before departing.

Never Floor the Gas Pedal

One of the ways that many drivers consume too much gas is by hard acceleration and braking.

Flooring your gas pedal when you accelerate fully opens up the air valve to your engine. To ensure the proper air-to-gas mixture, the engine control unit will compensate by opening up the throttle and feeding more gas into the engine. Usually, this excessive gas is wasted or consumed inefficiently.

Keeping your gas pedal floored will also prohibit your transmission from shifting gears in a timely fashion. This will lead to harder acceleration in lower gears, which uses much more fuel. Remember, consistently driving in your top gear is how to get better gas mileage.

This might seem strange, but cautious braking at stoplights can also increase your gas mileage. Some drivers might wait until the last moment before hitting the brakes hard and coming to a stop, but this isn’t ideal if you’re conscious of your fuel usage.

If you start your deceleration early by coasting to the stoplight, in many cases, the stoplight might turn green before you fully stop. When this happens, you can save some of the energy from your forward motion and use it to accelerate again. Accelerating your RV from a full stop uses a lot of gas that you can save by anticipating stoplight changes and slowly braking.

Turn the Engine Off Instead of Idling During Long Breaks

It should go without saying that leaving your engine idling for long periods of time is an unnecessary waste of gas. Most drivers know that they should turn off their engines when they expect to be idle for a long time.

Many drivers, especially older ones, believe that starting the ignition on your vehicle uses more fuel than letting it idle. This may have been true in some older car models with carburetors, but modern fuel injectors technology has improved fuel efficiency during engine ignition. These days, turning your engine off rather than letting it idle is how to get better gas mileage.

Of course, sometimes an RV driver needs to keep his engine idling, especially if the engine alternator is charging the battery or powering internal appliances such as the water pumps. These gas expenditures might be necessary, but idling your engine when waiting for your friends and family to load into the RV is usually a waste of gas.

But before you make a habit of turning your engine on and off at every opportunity, you need to be aware that frequently starting the engine can be bad for the RV battery. Try to strike a careful balance between wasting gas during breaks and overusing your battery to start the engine.

Use Cruise Control for Better Fuel Economy

Cruise control is an excellent way to get better gas mileage. Your best gas mileage will happen when your vehicle maintains a steady speed, without frequent acceleration. Cruise control is the best way to maintain that speed, as long as the roads aren’t inclined or declined. 

If you’re driving through hills or mountains, it’s best for your fuel economy if you control your speed manually.

Keep Your Tires Pressurized and Maintained 

Nothing slows down your gas mileage like low-pressure tires. In fact, sometimes you can even feel the difference in steering and accelerating when your tires have insufficient pressure.

When your RV tire pressure is low, it requires more energy to move the wheels over the flattened base of the tires. This energy requirement uses more gas, which lowers your fuel mileage. It can especially make a big difference over long road trips.

Check your recommended tire pressure before setting out on long trips. You can usually find this information on a sticker inside the vehicle door. You can either use a personal tire gauge to check your tires pressure, or check your tire pressure at the gas station.

You should also regularly check the treads of your tires. Worn-out treads don’t have adequate traction and will start to slip or skid on the road surfaces. If your tires slip while you’re accelerating, you may be burning up extra gas without going anywhere.

The typical way to check your tire tread is with a quarter. When you slip a quarter into the treads, the tread should cover the date on the coin. If you can still read the coin date, it might be time to change your tires.

Reduce Air Resistance and Drag

Air resistance can also cause your gas mileage to steeply drop. Car manufacturers have realized this, and design their cars to be aerodynamic with minimal drag. Your RV, unfortunately, is designed to provide you with a spacious, comfortable camping experience, so it’s much more difficult to reduce its air resistance.

Newer RV models have an aerodynamic design at the front edge that helps reduce drag. There are also a few after-market accessories that you can install on the top and sides of your RV to make it more aerodynamic. These accessories create wind patterns around your RV body that can stabilize it on the highway and also decrease your air resistance.

If you’re towing a trailer, you can also improve your RV gas mileage by reducing the drag that gets caught between your vehicle and the trailer. You can usually find spoilers to attach to your vehicle’s roof that lets the air slide right over the trailer without causing additional drag.

If you have extra attachments such as a bike rack, which you won’t be using, take it off for the duration of your drive to improve engine efficiency and save on fuel costs.

The best way to reduce drag without expensive attachments is simply to limit your speed while driving on the highways. Air resistance increases with speed, so driving too fast will also consume your gas too quickly.

Reduce Weight in Your RV

Weight is another big factor affecting gas mileage. Decreasing the weight in your RV can really help you save at the pump.

If you know that your campgrounds have water hookups, then you might want to empty your tanks before driving. The water in your freshwater tank can really add on the pounds.

Buying supplies closer to your destination can also help. You can go to a supermarket close to the campground for food, drinks, and cooking supplies rather than hauling that stuff down the highway.

Also, avoid overpacking. We know that it’s easy to get worried about running out of food, supplies, or clothes when you’re out camping, but overpacking not only weighs down your RV but also usually leads to more waste after the trip.

Use Your Top Driving Gear

As mentioned earlier, your higher gears are more fuel-efficient than the lower gears. If you’re driving a manual transmission, shift earlier rather than later, and your gas savings will start to add up.

Of course, your vehicle is probably an automatic transmission. By accelerating slowly and not flooring your gas pedal, you can help your RV shift earlier into the higher gears and increase your gas mileage that way.

Schedule Regular Maintenance

Keeping your vehicle properly maintained is essential for better gas mileage.

Regularly Replace the Engine Air Filter

When your engine’s air filter becomes dirty and clogged, it has to work harder to take in oxygen to burn with the gas. Sometimes this extra work can decrease your gas mileage by as much as 10 percent.

Your engine’s air filter needs to be replaced every 12,000 to 15,000 miles. You or your mechanic should be keeping track of the last time you had the air filter replaced, but if you don’t remember replacing it in the last year then it’s probably about time.

Check Your Spark Plugs

When spark plugs misfire, this causes the engine to use extra fuel without giving you any extra speed or distance.

Bad spark plugs can affect your RV fuel economy by as much as 30 percent, according to the National Institute for Automotive Service Excellence. If you find that you are spending more at the pump than you expected, get your spark plugs checked out.

Routine Tune-Ups

Regular tune-ups usually improve your fuel mileage by 3–4 percent. This might not seem like much, but tune-ups are necessary anyway for proper engine maintenance and to prevent breakdowns. 

Faulty Oxygen Sensors

However, a tune-up can detect if you need to replace a faulty oxygen sensor, and this can improve your fuel efficiency by as much as 40 percent.

Check Your Motor Oil/Change Your Oil

As the lubricating oil in your engine gets old, it breaks down and can’t perform its function as well. Your engine starts to run hotter, wasting energy on friction instead of smooth operation.

Old oil also leaves build-up and deposits in your engine, which makes it work harder to cycle the cylinders.

Getting your oil changed every 3000 to 5000 miles, or every 6 months, is a quick and easy way to get better gas mileage. You should also visually check your motor oil every time you fill up at the gas pump, to make sure your engine has sufficient fuel and that the oil isn’t compromised.

Avoid Refueling on the Weekend

This isn’t exactly a tip on how to get better gas mileage, but instead, this is advice for saving money at the gas pump.

Gas prices generally increase on the weekends. There are many reasons for this. Many drivers only find the time to refuel on the weekends, so gas stations raise their fuel costs because of the increased demand.

Also, many vacationers just like yourself start their trips on the weekends. Gas companies understand this, and they know that you’ll fill up your vehicles before starting out.

If you can, fill up your fuel tank early in the week before your trip. Especially with your large RV gas tank, this can save you a lot of money.

You might also consider keeping some gas canisters filled in your car or recreational vehicle so that you can fill up at the end of your trip, before heading home. This way, you can avoid the expensive gas stations that you find near your tourist destinations. The gas companies will hate you for your smart preparation and careful planning.

Don’t Waste Your Money on Premium Gas 

Here’s another tip to save at the fuel pump: just get regular unleaded for your RV.

Unless your owner’s manual specifies a higher octane rating fuel, your engine will run just fine on regular. Premium octane will not improve your gas mileage. Your bottom line will definitely appreciate the savings from using regular gas.

Open Windows or Air Conditioning?

Keep Windows Up on the Highways

It might be counterintuitive, but using your air conditioning is more fuel-efficient than opening your windows when traveling at high speeds.

Open windows will significantly increase your vehicle’s drag and slow you down. Your engine will have to work much harder to keep you moving down the highway, and this will quickly drain your gas tank.

Even though your AC uses a lot of power, when you’re flying down the open roads, your engine will prefer to cycle the AC rather than pushing your vehicle harder.

Don’t Use the AC

Of course, if you can handle the heat, keep your AC off. No matter how you use it, your AC is one of the most energy-intensive parts of your driving or camping experience, so operating it sparingly will really improve your fuel economy and your RV miles per gallon.

Plan Your Departure to Avoid Traffic

Getting stuck in bad traffic will drain your gas tank faster than anything else. It’s frustrating, hot, and slow-moving.

When you’re stuck in a traffic jam, your vehicle usually doesn’t shift into the upper gears. In fact, you might stay in first gear for long periods. This is a horribly inefficient way to travel and will result in bad gas mileage.

Not only are you moving slow and wasting gas in your lower gear, but even with the windows rolled down you probably won’t be getting much breeze. In this situation, you’ll probably end up using your AC and consuming more gas this way.

Avoiding peak traffic periods is a great way to get better gas mileage, and in general, enjoy your driving time much more. 

RV and Trailer Specific Tips

There are two things you need to know about your RV specifically if you want to understand how to get better gas mileage.

First, it’s important to balance your rig and load your RV properly. Keep heavy items near the floor, and make sure you don’t unbalance your RV on one side. If your RV shows any signs of tilting while you are parked on level ground, this is a big sign that your gas mileage will suffer.

Second, if you’re towing an RV trailer, or if your RV is towing a trailer behind it, make sure you don’t exceed the weight load on the tongue. Check the operating manual to find out the maximum tongue load and balance your trailer weight accordingly. An overloaded tongue is harder to handle while driving and will also decrease your gas mileage.


If you learned something from this article, please feel free to share it on social media or send it to your RV friends and family. We are sure that if you apply the advice on this list, you will save a lot of gas money on your next trip.

As always, we welcome your comments below, whether advice, experience, or further questions!

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