The Giant Guide to Motorhome Gas Mileage (With 21 Examples)

Knowing the gas mileage your car gets is super important because you can figure out what to expect in costs of travel and can work on figuring out how to improve the mileage your vehicle is getting. This same thing applies to motorhomes. However, motorhomes’ gas mileage is much worse than normal cars.

What is the average gas mileage for motorhomes?

  • Class A Motorhomes –> 7-13 avg. mpg
  • Class B Motorhomes –> 18-25 avg. mpg
  • Class C Motorhomes –> 14-18 avg. mpg

Different types of motorhomes are going to have different gas mileage because of their different sizes and builds. The heavier and larger the motorhome is, the worse the gas mileage is generally going to be. Gas mileage can also vary depending on shape. So what are the differences between Class A, Class B, and Class C motorhomes and why are their gas mileages so different?

Class A Motorhomes

Class A motorhomes get the worst mileage out of the three types of motorhomes. This is due to the massive size and bus-like configuration of the vehicle. Class A motorhomes have a very blunt, and large build with all sides of the vehicle being very flat and abrupt, like that of a bus.

The Class A motorhome gets the worst gas mileage because of its very large and flat features which make road travel hard due to disturbances in wind force and a heavy weight to have to pull. The front of this bus-like vehicle is very flat which makes travelling difficult because it has to push against the natural force of wind when in motion and the wind has no easy way to glide off of the vehicle. This lack of a smooth, slanted surface for easy wind flow, makes the engine have to work harder to power and pull the vehicle.

Another huge factor in the awful gas mileage of this RV is the massive weight. Class A motorhomes on average weigh 35,000 pounds which is the equivalent of about 17.5 tons! This is a lot of vehicle weight that the engine has to pull, resulting in a LOT of work that the engine has to do in order to pull the vehicle which eats up your fuel. The more work the engine has to do, the worse the gas mileage is going to be.

The average mileage that this type of motorhome gets is around 7 to 13 miles per gallon.

Below are some examples of popular Class A motorhomes and their gas mileage:

Fleetwood Bounder 8.5 mpg
Tiffin Open Road Allegro 32 SA7 mpg
Thor Palazzo10 mpg
Forest River Berkshire9 mpg
Newmar Dutch Star 8 mpg
Fleetwood Excursion10.1 mpg
Monaco Vesta10.7 mpg

Class B Motorhomes

Class B motorhomes get the best mileage out of all three types of motorhomes. This is because of the shape and weight of the vehicle. Class B motorhomes have a very sleek build and the front end of the vehicle (hood and window) is slanted with a smooth transition to the roof of the vehicle.

This lack of disturbances to the flow of wind force help the car to get better gas mileage. Without an abrupt, flat surface working against the flow of the wind force, it can travel much smoother than Class A and Class C motorhomes. This helps to provide Class B motorhomes with better mileage due to not having to work so hard to push through opposing forces.

Another factor that plays into the good gas mileage of this RV is the weight. This is the lightest type of motorhome you can get. Weight is a huge factor in determining how much the engine will have to work to power and pull the vehicle, which factors into how good or bad of gas mileage a vehicle will get. The lighter weight of this RV helps the engine to not have to work quite as hard which improves the gas mileage that the car gets.

The average mileage that this type of motorhome gets is around 18 to 25 miles per gallon, which is actually better than some larger diesel trucks even get.

Below are some examples of popular Class B motorhomes and their gas mileage:

Winnebago Travato 59G20 mpg
Airstream Interstate Grand Tour Ext19 mpg
Midwest Automotive Design Passage
170 Ext MDP4 Lounge
19 mpg
Roadtrek CS18 mpg
Airstream Grand Tour Twin17 mpg
Winnebago Rialta19 mpg
Roadtrek Sprinter RS Adventurous20 mpg

Class C Motorhomes

The Class C motorhome comes as second best in the running for best mileage and this, as you may have guessed, is ALSO due to the build and weight of the RV. Class C motorhomes are similar in build to the Class B, but they have a few differences which factor into why Class C get worse gas mileage.

Class C motorhomes have a pretty smooth, sleek front like the Class B does, but Class C motorhomes have a bunk in the trailer portion that hangs over the cab of the cockpit in the vehicle. This overhang creates an obstruction for the flow of wind off of the vehicle, like the Class B motorhome has.

The Class C motorhome also weighs a bit more than a Class B does. This is due to the extra trailer space, from the overhanging portion of the trailer, and because Class C motorhomes are generally bigger than Class B motorhomes are. Like with Class A and Class B, this weight distribution and wind flow is what makes the Class C motorhome second in the ranking for best mileage.

The average mileage that this type of motorhome gets is around 14 to 18 miles per gallon.

Below are some examples of popular Class C motorhomes and their gas mileage:

Thor Freedom Elite 24FE13 mph
Forest River Sunseeker 2420 MSF7.4 mpg
Winnebago View 24V16.5 mpg
Tiffin Wayfarer 14 mpg
Fleetwood Pulse 24A15.2 mpg
Itasca Navion Motorhome18 mpg
Forest River 3010DS9 mpg


Type of Motorhome:Average Mileage:
Class A7-13 mpg
Class B18-25 mpg
Class C14-18 mpg
Best Mileage: Class B Motorhome

The gas mileage you will get when driving will vary depending on the state of your driving. Your vehicle usually has the best gas mileage at around 60 mph. You will also get worse gas mileage if you are driving up-hill, on uneven terrain, or on a curvy road. Your gas mileage will tend to improve when driving on a straight, flat road, have the coast on, or driving downhill.

What affects the gas mileage a Motorhome gets?

A big question that you might be thinking is “Why do motorhomes get such awful gas mileage?” The gas mileage numbers definitely seem absurd, but I will explain to you exactly why they are where they stand and it will make sense.

So, what causes this terrible gas mileage?

  • Weight
  • Size
  • Length

Weight of Your Motorhome

As you can tell, motorhomes are rather large vehicles. Along with this largeness, comes the weight of all of the parts that are incorporated in this pristine traveling machine. Plus, these parts can get quite heavy themselves. The engine for a motorhome itself can weigh anywhere from 500 to 2500 pounds easily. This is simply one of the many important and heavy parts that are put into the making of a motorhome.

Motorhomes weigh anywhere from 10,000-40,000 pounds. This is because of all of the many heavy parts that go into making these vehicles so they can run and drive etc. This heavy weight has to be pulled by the engine to get the car to drive forward. This pull on the engine will need to be fueled in order to perform this task, which is what ends up eating up your fuel and making your mileage not so great.


Another contributing factor to how bad your motorhome’s gas mileage is would be the size of the vehicle. The bigger the size of the motorhome, the worse gas mileage your motorhome will get. This is because with a bigger vehicle, comes bigger and more parts necessary for making it able to run. The more parts you incorporate, the heavier it gets and the more pull on the engine that it exerts.


Something else that contributes to this bad gas mileage would be how long your motorhome is, especially with Class A motorhomes. This correlates with the same logic as how the size affects the gas mileage. The longer your motorhome is, the bigger it will be. The bigger your motorhome is, the more parts it needs, making it heavier and harder for the engine to pull.

Really, the reason that motorhomes get such bad gas mileage is because they are just absolutely huge vehicles. They weigh tens of thousands of pounds and that weight is super hard for the engines to pull. This pull on the engine is what east up all of the fuel because the engine needs something to power it to perform these necessary tasks for the vehicle to continue running.

Diesel Gets Better Mileage Than Gas

If you are looking to find a motorhome that gets slightly better gas mileage, I would look into getting a diesel fueled motorhome instead of a gas fueled. This is because diesel fuel motorhomes get better gas mileage than gas ones do!

Diesel fuel actually provides around 10%-15% more energy than normal gasoline does which helps make it more fuel efficient. Because of this extra energy efficiency, diesel vehicles actually get 20%-35% better gas mileage than gasoline fueled vehicles. Because of this, diesel fueled vehicles can drive much further on the same tank of gas that a gasoline fueled vehicle might.

The U.S. Energy Department has a brief article explaining the efficiency of diesel fueled vehicles compared to gas that you can read here.

If you are looking into motorhomes that get better gas mileage I would suggest getting a diesel fueled one.

Tips on How to Improve Gas Mileage


  • Pack Light
  • Keep Up With Maintenance
  • Slow Down
  • Drive Smaller Motorhome
  • Use Cruise Control
  • Avoid Traffic
  • Tires and Inflation Levels
  • Smooth Driving
  • Air Conditioning
  • Don’t Leave Engine Running

Pack Light

The heavier the weight of the vehicle, the worse gas mileage you will end up getting because of the harder pull on the engine. Just like the general vehicle’s weight, anything you put in your motorhome is going to add to this overall weight pulling on the engine. By packing light for your trips, you can improve your gas mileage because you won’t have nearly as much pull on the engine.

When you put lots of stuff in your motorhome to take with you on your trip, it makes the vehicle MUCH heavier than it would be originally. This extra weight adds up much quicker than you would think it does. Just keep in mind how much weight you are adding to your motorhome when packing because anything you put in will add to this huff that the engine will have to go through to pull the weight, causing your gas mileage numbers to plummet.

Keep up with Maintenance

It is important to keep up with the general maintenance of your motorhome because that will help your RV to run at the optimal level. By keeping up with the general maintenance, your engine will run better and the other parts will work at pristine levels as well.

General Maintenance to Keep Up On:

  • Engine Check Ups
  • Fluid Check Ups and Replacement (Oil, Windshield Washer, Radiator, Power Steering, Brake, etc.)
  • Tire Pressure
  • Tire Rotation/Replacement
  • Brake Replacement
  • General Cleaning (Inside and Out)
  • Etc.

Having everything in pristine condition, up to date and as clean as can be, will help everything to run better and make your trip better.

Slow Down

Your vehicle is going to get the best gas mileage when driving at about 60 mph. If you are looking to get the best gas mileage possible, drive as close to 60 mph as possible. By managing your lead foot, you can save yourself a bit of money by getting better gas mileage.

Drive a Smaller Motorhome

Like with normal vehicles, driving a smaller vehicle will help you to get better gas mileage. This is because the vehicle is lighter in weight, which creates less of a pull on the engine.

Class B motorhomes are actually the RV’s of this style that will get the best mileage, compared to Class A and Class C. Along with generally being a smaller size than the others, The sleek build and styles of this RV, specifically the smooth, slanted front, helps as well because the wind a smooth surface to roll off of instead of the blunt impact it would get when going against a Class A or Class C motorhome.

Use Cruise Control

When driving without cruise control, most people tend to fluctuate their speeds quite a bit. This constant fluctuation of speed will pull harder on your engine because it has to adjust to each fluctuation, resulting in worse gas mileage.

A way to improve your gas mileage and avoid this engine pull is to set your cruise control whenever possible during travel. By setting your cruise control, your vehicle’s speed won’t be fluctuating all of the time and won’t pull on the engine nearly as much, improving your overall gas mileage.

Avoid Traffic

Like using cruise control, it is best to avoid traffic so that you can avoid stop-and-go style driving. This constant fluctuation in speeds and pull on the engine from the stop-and-go driving will really eat up your fuel, resulting in worse gas mileage. Avoiding heavily populated areas, and especially inner city driving, will help to improve your gas mileage by eliminating the stop-and-go style driving.

Smooth Driving

Another thing that can be contributing to your bad gas mileage could be rough driving. If you aren’t able to drive in a straight line or are traveling on a bumpy road, or even off-road, this will contribute to horrible gas mileage.

Driving conditions that fall under this “rough” category include, but are not limited to, driving on a very curvy road, bumpy or unpaved roads, bad weather conditions such as snow, ice, wind, or rain, driving on a road with lots of hills, and basically anything that doesn’t involve driving on a flat road in a straight direction.

You can do your best to drive smoothly by driving in a straight line instead of ping-ponging in your lane or switching lanes a bunch and avoiding harsh weather and harsh road conditions if possible.

Air Conditioning

Running your air-conditioning on full blast while traveling can contribute to bad gas mileage as well. Running your air conditioning creates a pull on your engine because it has to run harder to power both your vehicle driving and power the air conditioning unit to provide you and your passengers with cold air.

Air conditioning won’t cause as much of a pull as other factors, it only costs you about 1 mpg from your overall gas mileage. But if you are doing anything in your power to get better gas mileage and you think this is worth it, then try running your air conditioning on the lowest setting possible or not at all.

Don’t Leave Engine Running

This is another thing that doesn’t do much but it does make a small impact on things still. Leaving your engine running seems like a super harmless task because you aren’t moving so it shouldn’t really burn up your fuel right? Well, that is actually wrong.

When your engine is running, it needs something to sustain it in order for it to run. This is where fuel comes into play. Leaving your engine running while the car is parked uses much less fuel compared to when it is trying to power a moving car, but this small act can still make a damper in your gas mileage.

Running your engine while parked makes a small impact on your gas mileage so it is ultimately up to you, of course, whether this is important enough for you to give up or not.

This video I have added is another great source of information and logistics on what improves or reduces your fuel economy for your RV.

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