What Kind Of Gas Should You Put In A Motorhome?
One thing all RVs on the road have in common is that they need to be refueled. It seems like we’re always trying to maneuver around gas stations and truck stops.
While most people know whether their RV engine runs on gasoline or diesel, a question I repeatedly have been asked by family and friends is whether they should use regular or premium gasoline.
It often leads to another question which relates to the on-board generator, that in most cases shares the fuel tank with the RV engine.
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Choosing the right type of gas for your motorhome is essential for maintaining its performance.
This guide will cover the basics of fuel types, considerations for different engines and generators, and best practices for storing your motorhome in winter.
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Understanding Gasoline Types: Regular vs Premium
Gasoline comes in various grades, typically categorized by octane ratings. The two most common types are:
- Regular Gasoline – Usually with an octane rating of 87, regular gas is the most commonly used fuel type for most vehicles on the road. It is cheaper and works well with engines designed for lower octane fuel.
- Premium Gasoline – Typically with an octane rating of 91 or higher, premium gasoline is more expensive and is often recommended for high-performance or turbocharged engines. The higher octane level helps prevent knocking or pinging, which can damage engine components over time.
For motorhome owners, the choice between regular and premium gas depends on the specific engine requirements outlined in the owner’s manual.
Most motorhomes, especially those with standard gasoline engines, are designed to run efficiently on regular gasoline.
However, some models, particularly those with high-performance or turbocharged engines, may benefit from premium gas.
Always refer to the manufacturer’s recommendation for the specific octane rating required for your motorhome.
Motorhomes with Generators
Motorhomes often come equipped with built-in generators, and these generators typically draw fuel from the same gas tank as the RV’s engine.
This raises the question of whether the generator’s requirements should influence your choice of gasoline.
- Generator Requirements – Most generators used in motorhomes are designed to run on regular gasoline, much like the motorhome’s primary engine. They are not high-compression engines and do not benefit significantly from the higher octane levels found in premium gasoline.
- Fuel Consistency – If both your motorhome engine and generator can run on regular gasoline, there is no need to purchase premium fuel. Inconsistent use of different fuel types can cause complications, especially when fuel lines share the same tank. Keeping it simple with regular gas ensures both the engine and the generator perform optimally.
- Fuel Stabilization – Regardless of whether you’re using regular or premium gas, consider adding a fuel stabilizer when using the generator frequently. Fuel stabilizers help prevent the gas from breaking down and becoming gummy, which can clog the generator’s fuel lines and carburetor.
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Does Premium Gas Help in Winter Storage?
When it comes to winter storage, some RV owners believe that using premium gasoline will help the engine start better after months of inactivity.
However, this is a misconception. The octane rating of the fuel does not play a significant role in storage stability.
- Fuel Quality Over Octane Rating – Both regular and premium gasoline can degrade over time if not properly stabilized. The key to proper winter storage is not the octane rating but rather using a fuel stabilizer. A stabilizer can prevent oxidation and phase separation in ethanol-blended fuels, which are common problems in stored gasoline.
- Preventing Fuel Deterioration – Before storing your motorhome for the winter, fill the tank to about 90-95% capacity and add the recommended amount of fuel stabilizer (more on that later). This prevents moisture from condensing inside the tank and keeps the fuel fresh for up to 12 months. Running the engine and generator for a few minutes after adding the stabilizer ensures that the treated fuel circulates throughout the system.
- Regular Maintenance During Storage – Periodically starting the engine and generator during the storage months, if possible, can help keep the engine lubricated and prevent seals and gaskets from drying out. This also ensures that any treated fuel continues to circulate.
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Best Fuel Treatment For Motorhome Storage
Sea Foam Motor Treatment
When it comes to preparing your motorhome for storage, especially during the winter months, using a quality fuel stabilizer is crucial.
Sea Foam Motor Treatment (SF-16) is an all-in-one solution designed to clean and stabilize fuel systems, lubricate upper cylinders, and prevent moisture buildup in gasoline and diesel engines.
It’s particularly effective for long-term storage, where fuel degradation can lead to problems like varnish, gum buildup, and clogged fuel injectors.
Main Features
- Fuel Stabilization – Keeps gas fresh for up to two years, preventing oxidation and gum formation.
- Engine Cleaning – Cleans fuel injectors, carburetors, and intake valves, ensuring smooth engine performance.
- Moisture Control – Helps to prevent moisture buildup in the fuel system, reducing the risk of corrosion.
- Multi-Purpose Use – Suitable for all types of gasoline and diesel engines, including those in motorhomes, boats, and other recreational vehicles.
Benefits of Using Sea Foam in a Motorhome
- Improved Engine Performance – When added to the fuel tank, Sea Foam helps dissolve deposits and buildup within the engine and fuel system, which can improve fuel efficiency and reduce exhaust emissions.
- Prevents Fuel Deterioration – For motorhome owners who store their vehicles for extended periods, fuel degradation is a common concern. Sea Foam stabilizes the fuel, preventing it from breaking down and turning into varnish, which can clog fuel lines and carburetors.
- Protection Against Ethanol Problems – Ethanol-blended fuels can attract moisture, leading to phase separation and corrosion. Sea Foam helps mitigate these issues by drying out moisture and preventing corrosion, making it a necessary addition for motorhomes running on ethanol-blended gas.
- Ease of Use – Using Sea Foam is straightforward, simply add the recommended amount to the fuel tank before storage or periodically while in use. For motorhomes, it is often recommended to add 1 ounce per gallon of fuel for storage purposes. After adding, run the engine and generator for a few minutes to ensure the treated fuel circulates throughout the system.
- Multi-Use – Besides being excellent for storage preparation, Sea Foam can also be used regularly to keep the engine clean and running smoothly. It’s compatible with both motorhome engines and built-in generators, providing comprehensive protection across the entire fuel system.
How to Use Sea Foam in a Motorhome
- Add to the Fuel Tank – Pour the recommended amount of Sea Foam directly into your motorhome’s gas tank. For effective storage protection, the standard recommendation is 1 ounce of Sea Foam per gallon of fuel.
- Run the Engine and Generator – After adding Sea Foam, run both the motorhome’s engine and any built-in generator for about 5-10 minutes. This step ensures the treated fuel circulates through the entire fuel system, protecting the fuel lines, injectors, and carburetors from deposits and moisture.
- Store Your Motorhome – After treating the fuel with Sea Foam and running the engine, proceed with the rest of your storage preparations. Your motorhome will be ready to sit idle for months without the worry of fuel degradation or engine trouble when it’s time to hit the road again.
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Other Considerations for Motorhome Fuel Use
Ethanol-Blended Fuels
Many gas stations sell fuel with varying levels of ethanol, such as E10 (10% ethanol) or E15 (15% ethanol). Ethanol can attract water, which can lead to phase separation, particularly in storage.
It is generally recommended to use fuel with lower ethanol content for motorhomes and especially for storage. Some manufacturers even advise using ethanol-free gasoline for generators.
Fuel Efficiency Myths
Some motorhome owners believe that premium gasoline will provide better fuel efficiency and power.
However, unless your engine specifically requires high-octane fuel, there is no significant gain in performance or mileage from using premium over regular gasoline.
The cost difference often outweighs any marginal benefits.
Environmental Impact
Regular gasoline tends to have a lower carbon footprint than premium gasoline. Premium gas doesn’t necessarily burn cleaner; the difference lies in its octane rating, not its environmental friendliness.
When using gasoline blended with ethanol, which is derived from corn or other renewable sources, the overall emissions profile can change.
Ethanol blends, for instance, can reduce greenhouse gas emissions compared to pure gasoline, but they may also result in slightly lower fuel economy.
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Best Practices for Fueling Your Motorhome
- Follow Manufacturer’s Recommendations – Always start with the owner’s manual to understand the recommended fuel type and octane rating for your specific motorhome model. This will ensure optimal performance, fuel efficiency, and longevity. Vehicle manufactures usually have manuals available online if you don’t have the original on hand.
- Consider Fuel Stabilizers – Whether you’re running the generator frequently or preparing for winter storage, a fuel stabilizer is a cost-effective way to maintain fuel quality and engine health.
- Regular Maintenance Checks – Keeping the fuel system clean, from the tank to the injectors and carburetors, is crucial. Ensure you check and replace fuel filters regularly, inspect fuel lines for wear and tear, and keep an eye on the fuel pump’s condition.
- Monitor Fuel Quality – Not all gas stations provide the same quality of fuel. It’s a good idea to choose reputable fuel stations known for maintaining clean tanks and regularly servicing their pumps. This can prevent contaminants from entering your motorhome’s fuel system.
- Understand the Impact of Fuel Types on Generators – If your generator draws from the same tank, prioritize consistency in the fuel type. Both the engine and generator will perform best when using the same type of gasoline, avoiding potential issues like fuel line clogs and inconsistent combustion.
- Prepare for Different Driving Conditions – If you’re traveling through varying altitudes, climates, or terrains, understand that the fuel type alone doesn’t determine performance. Altitude can affect air-fuel mixtures, requiring adjustments to the carburetor or fuel injectors. Be prepared to perform these adjustments or consult a professional.
Conclusion
For most motorhome owners, regular gasoline is the appropriate choice, as it meets the engine requirements and ensures that built-in generators function without issue.
The use of premium gasoline is generally unnecessary unless specified by the manufacturer for certain high-performance engines.
For winter storage, the focus should be on proper fuel stabilization rather than choosing a higher octane fuel.
By following the manufacturer’s guidelines and taking simple steps to maintain fuel quality, motorhome owners can ensure their vehicles perform optimally on the road and during storage.
This approach not only extends the life of the engine and generator but also reduces overall maintenance costs and enhances the travel experience.
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Frequently Asked Questions
Can I use regular gas in my Class A motorhome?
Yes, most Class A motorhomes with gasoline engines are designed to run on regular gas (87 octane). Always check your owner’s manual for specific recommendations.
Unless your motorhome’s engine requires premium gas, using it won’t significantly improve performance or fuel efficiency. Regular gas is sufficient for most engines.
No, premium gas does not offer benefits for winter storage. Instead, use a fuel stabilizer with regular gas to prevent fuel degradation during storage.
Does my motorhome’s generator need a different type of gas?
Most built-in generators are designed to use the same regular gasoline as the motorhome’s engine. Using the same fuel type helps maintain consistency and performance.
Can I use ethanol-blended fuel in my motorhome?
You can use ethanol-blended fuels like E10, but it’s generally recommended to avoid higher ethanol blends like E15. Ethanol-free fuel is preferred, especially for storage.
How often should I add a fuel stabilizer?
Add a fuel stabilizer every time you store your motorhome for more than 30 days, and run the engine and generator for a few minutes to circulate the stabilized fuel.
Not typically. For engines designed for regular gas, premium gas will not significantly improve fuel economy or mileage, and the extra cost is often not justified.
What should I do if my motorhome engine knocks or pings?
Engine knocking can sometimes occur if the octane level is too low for your engine. Check your manual, and consider using a higher octane fuel if recommended by the manufacturer.
Have more questions. Leave a comment below.
