It's printed on the gas cap on mine... Without going out and looking I believe it's 10%. Most gas in Ohio is "may contain up to 10% ethanol". But you can buy "racing fuel" at most Sunoco stations with no ethanol... expensive though.
The extra octane is a waste of money IF your engine doesn't require it. Some people claim it runs better, but the science says otherwise. Use what your manual recommends. Higher octane is a waste... lower octane can cause knocking which could do damage long term.
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