I know a lot of folks swear by 93, but in CA all we have is 91 and my car runs great. All I hear is how crappy the gas is here, and maybe because I live here it's all I know, but the car feels pretty damn quick to me. If I had access to 93 obviously I'd be all over it. If your question is about hurting the car I wouldn't give it a second thought. It says right in the book that 91 is fine.
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