Heck, all I can ever find is 91 octane for my Cayman. That is the normal "premium" here in Missouri. The car seems to run fine on it, although if I could find 93 or 94 octane, maybe it would run better yet. I do try to avoid the 91 octane that says it contains methanol, since the methanol would indeed reduce performance over a comparable "straight" 91 octane.
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