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Originally Posted by Allch Chcar
This is all I could find in the BRZ manual.
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It also says this on page 420:
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Fuel octane rating
This octane rating is the average of the Research Octane and Motor Octane numbers and is commonly referred to as the Anti Knock Index (AKI).
Using a gasoline with a lower octane rating can cause persistent and heavy knocking, which can damage the engine. Do not be concerned if your vehi- cle sometimes knocks lightly when you drive up a hill or when you acceler- ate. Contact your SUBARU dealer if you use a fuel with the specified octane rating and your vehicle knocks heavily or persistently.
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