Do You Get More Gas Mileage With 89 Octane?

Written by philippe lanctot
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Do You Get More Gas Mileage With 89 Octane?
Your owner's manual will tell you which gas octane rating to use in your car. (petrol station image by Mat Hayward from

The octane rating for gas relates the amount of energy required to ignite the fuel and run your car's engine. High octane gas is mainly used to power high performance cars. Your owner's manual will tell you what octane to use; most regular cars require only regular octane gas.

Higher Octane for Regular Octane Cars

Most regular cars run on regular octane. Federal Trade Commission reports state that using higher octane gas in your regular car does not improve gas mileage. Higher octane is only recommended for cutting down on engine knocking.

Cars Requiring Higher Octane

Cars designed to run on 89 octane can get better gas mileage due to the compression and ignition timing of the engine. These engines are specifically designed to run on higher octane gas;. If your owner's manual tells you to use regular octane gas, you will get not get improved mileage from using 89 or higher octane gas.

Reduced Engine Knock

Gas that does not properly ignite can result in engine knocking or pinging. Higher octane gas can help reduce the engine knock and help the engine run more efficiently. Make sure the owner's manual says it is OK to use higher octane gas in your car, even if you have engine knock problems.

Various Octane Ratings

The octane rating defines the percentage of octane contained in gas. Regular gas is rated 87 octane, meaning it contains 87 per cent octane to 13 per cent heptane or other fuel to help ignition. Mid-grade is typically rated 89 octane and super, or premium, gas generally carries a rating of 91 or 92 octane.

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