Yes. 91 octane is the minimum requirement.
It is required due to the high static compression of the motor.
But when you consider the size of the Civic SI petrol tank, you're only looking at another $2.00 ± per tankful.
The return on that small investment is huge.
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Last edited by TheOtherDave™; May 9, 2007 at 11:42 AM.
Reason: Typo (God forbid!) :o