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High compression engines, found in most performance cars, require a fuel that burns
efficiently at a higher temperature. That’s what premium fuel does,
it burns hot under high compression. In a normal engine, premium fuel
does not burn completely, resulting in excess carbon build-up and carbon
fouling of the spark plugs.
The end result is a less efficient engine that requires tune-ups more frequently.
Oh, yeah, did I mention it also wastes money?
The only time you might need to switch to a higher octane fuel is if your car
engine knocks when you use the recommended fuel. This happens to a small
percentage of cars. Check your owner’s manual to determine the right octane
level for your car. Regular octane is recommended for most cars. However, some
cars with high compression engines, like sports cars and certain luxury cars,
need mid-grade or premium gasoline to prevent knock.

by David W. Bynon
Copyright (c), 2000, Autopia Car Care -- All Rights Reserved
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Did you know...
Myth about Premium Gas
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