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Old 11-14-2012, 12:57 PM
MouseFink MouseFink is offline
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I know for a fact that 10:1 can be used with 93 octane pump gas if the pump gas is Chevron/Texaco. The octane at the El Cheapo independent stations that buy gasoline on the spot market is questionable.

I was told buy an owner of a 1968 Corvette that if you have a older engine without computer controls, the engine can have as high as 11:1 CR and run well on E85 Ethanol 110 octane pump gas. My 1963 Pontiac 421 HO had 12:1 CR and it would not run on anything but 100% VP C12 108 octane racing fuel.
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