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writeup available at http://www.ni.com/svix/engine_knock.htm
As a vehicle's engine ages, the octane required to prevent knock may increase. This condition is referred to as Octane Requirement Increase, or ORI, and is the result of normal engine wear. In instances where you experience occasional or moderate knocking, your first line of defense is to try a higher octane gasoline to accommodate this Octane Requirement Increase of your engine. Severe knocking, which cannot be remedied by using a higher octane grade of gasoline, demands your authorized mechanic's attention.
The octane level recommended by your vehicle's manufacturer is a good starting point. But, price, driving habits and personal preference also are important. And so are individual vehicle characteristics.
>>For example, research shows that cars the same age with identical engines have different octane requirements, probably due to manufacturing tolerances. <<<<
The best advice is: try different gasolines, observe how they perform in your car, and pick the one that meets your needs.
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