[Christ]

It's a huge issue over whether high compression engines actually need higher octane fuel... if you were just a backyard engine builder, it'll be somewhat difficult for you (as many others - no offense intended) to understand that high initial (static) compression really doesn't mean too much when the engine is running - dynamic compression and mixture velocity/consistency is what's important.

If you're interested in such things, The Old One - Energy Dynamics has an interesting archive of articles and information from Larry Widmer, who's done alot of research and development on the subject. He runs (daily driver) a supercharged 12:1CR (may be slightly higher) B-series Civic on pump gas.