Can You Use Leftover Lawnmower Gas in Your Car? Tips and Concerns

Switching from a gas-powered lawnmower to an electric one is a smart decision for reducing emissions and noise. However, what do you do with the leftover gas from your lawnmower? Can you use it in your car? This article will explore the nuances of using leftover lawnmower gas in your vehicle, along with some tips and considerations.

Can You Pour Leftover Lawnmower Gas Into Your Car?

Yes, you can pour leftover lawnmower gas into your car, provided that it hasn’t been sitting too long and hasn’t been mixed with other substances. However, there are a few important factors to consider:

Gasoline Quality

Ensure the gasoline is not stale. Gasoline has a limited shelf life and can start to degrade after about 30 days, leading to potential performance issues in your car. Checking the age of the gas is crucial.

Additives

Some lawnmower gas may contain fuel additives. While most standard gasoline should be fine, if the gas was mixed with anything unusual, it may cause issues. Check the label or manual to ensure compatibility with your car's engine.

Contamination

Make sure the gas is free from contaminants like water or dirt before adding it to your car's fuel tank. Contaminated fuel can cause blockages and other mechanical issues.

Mixing Fuels

If your car runs on regular unleaded gasoline, it should mix well with leftover lawnmower gas, assuming it isn’t mixed with oil, which would be the case for a 2-cycle engine. Mixing in a small amount of old motor oil (about a tablespoon per gallon) can also help with compatibility.

Use Sparingly

If you're unsure about the quality of the leftover gas, consider mixing it with a larger amount of fresh gasoline to dilute any potential issues. This is especially important if the gas is old and has been sitting for a while.

What to Do with Old Gas

If the gas is old, it's best not to use it in your car. However, it probably won’t harm your car if it’s been sitting for a while and the tank has more than about 10 gallons and the amount of old gas is less than a quart. On the other hand, after replacing your gas mower with a battery electric model, it is a good opportunity to make the switch to cleaner, more sustainable energy sources.

Benefits of Going Electric

Modern electric lawn mowers, such as offerings from brands like EGO, Echo, and Cub Cadet, are incredibly efficient. They are known for their low noise levels, ease of use, and reduced emissions. While they may have a lower range compared to traditional gas mowers, their performance has significantly improved over the years. Reputable brands like DeWalt or Makita also offer electric mowers that are both powerful and reliable.

Alternative Uses for Leftover Gas

If you find yourself with leftover gasoline that you cannot use in your car, there are alternative ways to utilize it, such as for cleaning:

Oil-Based Cleaner

Old, stabilized gas can be a potent and effective cleaner. For instance, it can be used to remove very stubborn grease, oil, or even oil-based outdoor paint. I have found that mixing a small amount of old motor oil (about a tablespoon per gallon) can make it even more powerful and effective. This mixture can be used to clean oil stains off concrete or the floor during oil changes.

Ensure you use only a small amount of the cleaner and dispose of it properly. Never dump old gas or oil directly onto the ground, as it can contaminate soil and water. Instead, clean the area thoroughly with paper towels, scrub with soap and water, and dispose of the cleaner safely.

Tips for Safe Usage

Check the age of the gas. Confirm the gasoline is free from additives or contaminants. Ensure the gas isn’t mixed with oil, which would be the case for a 2-cycle engine. Mix it sparingly with fresh gasoline if you're unsure about the quality of the leftover gas. Dispose of old gas properly and use alternative cleaning solutions for gasoline.

Switching to electric lawn mowers not only helps the environment but also reduces the hassle of dealing with leftover gasoline. Happy mowing and cleaning!