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Also, as a point of order: 91 octane (AKI rating) is the highest that is available in many areas--including all of California--without getting "race gas" which is technically not legal for use on the street.
EDIT: And AKI rating is always less than RON, AKI is the average of RON and MON; the MON rating of a given batch of gasoline is from 8-10 points lower than the RON rating of that same gasoline. So the AKI rating will be about 4-5 points lower than RON for most gasoline.
-soD
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