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TiresTire Care Safety Guide at the Rubber Manufacturers Assn (RMA)
Federal Trade Comission (FTC)
About Octane at chemistry.about.com
Why use premium gas when regular will do? at usatoday.
Many people still think that higher octane is better for a variety of reasons including:
In fact, in most cases, using a higher octane gasoline than your owner's manual recommends offers absolutely no benefit. It won't make your car perform better, go faster, get better mileage or run cleaner. It could even be damaging to your car.
See the Octane for more information.