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You should never put less than 91 in a Civic Si. The engine can use it because it the ECU will prevent harmful conditions. Regular or 89 octane should only be used in emergencies though.
Personally I want my engine to make it to 180 to 200K or better which isn't that unrealistic if you look at a lot of Honda engines out there. Not that it'll get grandma driven and never rev'd up but I'm going to use decent synthetic oil and use the recommended fuel.
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