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I run almost 12:1 on 91 pump gas ( thats all we get here in Calif)... That said you must keep a high compression engine cool to avoid detonation regardless of gas you run. Never exceed the total timing safe for the temp you are running. Err on the conservative side with ignition curve. Don't run platinum plugs.
If you really want to run an additive use Tolulene or Xylene at no greater than 30%. Tolulene is 114 octane and can be gotten at most paint stores. It is commonly used as a paint remover.
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michael
A man that is young in years, may be old in hours, if he have lost no time. But that happeneth rarely. Generally, youth is like the first cogitations, not so wise as the second. For there is a youth in thoughts, as well as in ages... Sir Francis Bacon (1561-1626)
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