Why do some cars require premium gas? What happens if you don't use premium?

 
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484 IKU
Posted on Aug. 14th, 2008

octane is a severely misunderstood component of gasoline.

All an octane rating is, is an "Anti-Knock Index" and it ensures that the gasoline burns slower, and more evenly.

A knock occurs when a high compression motor uses less stable, lower octane rating gasoline, and the cylinder combusts before the piston is fully compressed.

People who claim enhanced gas milage or higher power, it seems to be mostly a placebo effect. The only way you will get more miles per gallon is if you are due for a tune up and your car is simply using one method of ensuring stability to compensate for the other.

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2,226 IKU
Posted on Aug. 14th, 2008

Some cars are tuned to run premium gas - generally higher performance vehicles. If you run regular in the car, it may not perform as well, and the gas mileage will also suffer. Even my 4cyl economy car runs better, and gets 3+ mpg more when I run premium fuel instead of regular 87 octane.

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3,017 IKU
Posted on Aug. 15th, 2008

suposedly they won't get as high gas mileage.

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