It's not in the compression ratio as much as the ECU mapping. The sport hatch recommends 91 and it has the same ratio as the other HB's. If you flash your ECU you tune (map) to your desired octane, the higher the octane the more HP you can get without detonation.
Finally an answer I called saeveral dealerships and even honda customer service and no one could answer that question. Thank you!!!
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