What is the difference in octane levels? Typically “regular” gas is 87 octane, “midgrade” is 89 octane and over 91 octane is “premium” gasoline. Some states label top-tier gasoline with 93 octane as “ultra” gas.

Answer. Explanation: Hydrogen, Oxygen, Nitrogen, Helium and all of the Noble Gases, Fluorine, Chlorine, Bromine, Mercury.

Examples of Gases

• Hydrogen.
• Nitrogen.
• Oxygen.
• Carbon Dioxide.
• Carbon Monoxide.
• Water Vapour.
• Helium.
• Neon.

Raising the octane rating (also known as the anti-knock index) doesn’t change the energy content of a gallon of gasoline. A higher octane rating indicates greater resistance to knock, the early combustion of the fuel-air mixture that causes cylinder pressure to spike.

Using regular gas in an engine that requires premium could void your warranty. That is most likely to happen if using regular causes severe engine knock or pinging (premature ignition of the fuel, also known as detonation) that damages the pistons or other engine parts.

Small engines have low compression ratios, meaning they won’t likely benefit from anything special in the gas like a higher octane rating. Some premium fuels may actually make your equipment harder to start. So save your money and use regular gas.

Premium gas, such as 93 octane, helps high-powered cars run smoothly and efficiently. There’s no need to run a small lawnmower engine on high-octane gas, but it won’t hurt your lawnmower, either. The only harm might be the dent left in your wallet from using the more expensive fuel.

Always refer to your owner’s manual for the correct fuel to use. While E10 fuels are approved for small engine equipment usage, it is not recommended, especially in handheld products. Gas with ethanol separates while being stored in your gas tank. E10 gas absorbs up to 50 times more water than standard gasoline.

What is the best small engine or lawn mower gas?

• Clean and fresh – fuel can begin to deteriorate in as little as 30 days.
• A minimum of 87 octane/87 AKI (91 RON); If operating at high altitude, see below.
• Gasoline with up to 10% ethanol (gasohol) or up to 15% MTBE (methyl tertiary butyl ether), is acceptable.

The higher octane gives premium gas greater resistance to early fuel ignition, which can result in potential damage, sometimes accompanied by audible engine knocking or pinging. It’s the fuel’s ability to be compressed more without pre-igniting that results in more power when used in the appropriate engine.

The FAA has allowed manufacturers to produce 100LL with significantly lower lead levels, as long as it meets specification, which it does. There is no issue with using Avgas in small engines. In fact, many 2 stroke engines last longer with leaded fuels.