Selecting the Ideal Gas for Lawn Mowers: A Complete Guide

by Anna

Selecting the right type of fuel for your lawn mower is essential for optimal performance and longevity. With various options available in the market, choosing the most suitable gas can be a daunting task for many homeowners. In this article, we delve into the different types of fuel commonly used in lawn mowers, their advantages and disadvantages, and provide recommendations to help you make an informed decision.



Gasoline is the most widely used fuel for powering lawn mowers. It is readily available at gas stations and comes in different octane ratings, typically ranging from 87 to 93. Most lawn mowers are designed to run on regular unleaded gasoline with an octane rating of 87.


Advantages of Gasoline:

Accessibility: Gasoline is widely available at gas stations, making it convenient for homeowners to refuel their lawn mowers.

Cost-effective: Gasoline is generally cheaper compared to alternative fuel options, making it a cost-effective choice for many users.

Performance: Gasoline provides consistent performance and power output, allowing lawn mowers to effectively cut grass without experiencing performance issues.

Disadvantages of Gasoline:

Environmental Impact: Gasoline combustion releases harmful emissions such as carbon monoxide, nitrogen oxides, and volatile organic compounds (VOCs), contributing to air pollution and greenhouse gas emissions.

Storage Concerns: Gasoline must be stored properly in sealed containers to prevent evaporation and reduce the risk of fire hazards.

Maintenance: Gasoline-powered engines require regular maintenance, including oil changes, spark plug replacement, and carburetor cleaning, to ensure optimal performance and longevity.

Ethanol-blended Gasoline (E10):

Ethanol-blended gasoline, commonly known as E10, contains up to 10% ethanol mixed with regular unleaded gasoline. Ethanol is derived from renewable sources such as corn, sugarcane, or switchgrass and is added to gasoline to reduce air pollution and dependence on fossil fuels.

Advantages of Ethanol-blended Gasoline:

Renewable Energy Source: Ethanol is derived from renewable biomass sources, making it a more sustainable alternative to traditional gasoline.

Lower Emissions: Ethanol-blended gasoline produces fewer greenhouse gas emissions compared to pure gasoline, contributing to improved air quality.

Engine Performance: E10 gasoline is compatible with most lawn mower engines and provides similar performance to regular gasoline.

Disadvantages of Ethanol-blended Gasoline:

Decreased Fuel Efficiency: Ethanol has a lower energy density compared to gasoline, resulting in reduced fuel efficiency and potentially higher fuel consumption.

Fuel Stability: Ethanol can attract water molecules, leading to fuel phase separation and engine performance issues if not used within a certain timeframe.

Compatibility Issues: Some older lawn mower models may not be compatible with ethanol-blended gasoline, leading to engine damage or poor performance if used incorrectly.

Non-Ethanol Gasoline:

Non-ethanol gasoline, also known as pure gasoline or ethanol-free gasoline, is gasoline that does not contain any ethanol additives. It is often preferred by users who prioritize fuel stability and engine performance over environmental concerns.

Advantages of Non-Ethanol Gasoline:

Improved Fuel Stability: Non-ethanol gasoline has a longer shelf life and is less prone to phase separation, making it suitable for long-term storage.

Enhanced Engine Performance: Non-ethanol gasoline can provide better engine performance and fuel efficiency compared to ethanol-blended gasoline, especially in older lawn mower models.

Compatibility: Non-ethanol gasoline is compatible with all types of lawn mower engines, including older two-stroke engines that may be sensitive to ethanol.

Disadvantages of Non-Ethanol Gasoline:

Availability: Non-ethanol gasoline may not be as readily available as ethanol-blended gasoline, especially in certain regions or rural areas.

Cost: Non-ethanol gasoline is typically more expensive than ethanol-blended gasoline due to higher production costs and lower demand.

Environmental Impact: While non-ethanol gasoline produces fewer emissions compared to ethanol-blended gasoline, it still contributes to air pollution and greenhouse gas emissions.


Propane is a clean-burning alternative fuel that is gaining popularity among environmentally conscious homeowners. It is a byproduct of natural gas processing and petroleum refining and is stored in pressurized tanks for use in various applications, including lawn mowers.

Advantages of Propane:

Environmental Benefits: Propane combustion produces significantly fewer emissions compared to gasoline, including lower levels of carbon monoxide, nitrogen oxides, and hydrocarbons.

Fuel Efficiency: Propane has a higher octane rating compared to gasoline, resulting in improved engine performance and fuel efficiency.

Storage Convenience: Propane can be stored safely in pressurized tanks for extended periods without the risk of evaporation or degradation.

Disadvantages of Propane:

Initial Cost: Converting a lawn mower to run on propane may require an initial investment in conversion kits or specialized equipment, which can be costly.

Limited Availability: Propane refueling stations may be less common compared to gasoline stations, limiting accessibility for some users.

Tank Size and Weight: Propane tanks are bulkier and heavier than gasoline containers, which may be impractical for some users, especially those with smaller lawn mowers.


Selecting the right type of gas for your lawn mower is crucial for ensuring optimal performance, fuel efficiency, and longevity. While gasoline remains the most widely used fuel for lawn mowers, alternatives such as ethanol-blended gasoline, non-ethanol gasoline, and propane offer distinct advantages in terms of environmental impact, engine performance, and fuel stability. Consider your specific needs, budget, and environmental concerns when choosing the best gas for your lawn mower, and don’t hesitate to consult with a professional if you have any questions or concerns. By making an informed decision, you can enjoy a well-maintained lawn while minimizing your environmental footprint.


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