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It has been done before with E85 in a built engine. I've heard of at least one big block hemi with 14.5 SCR on E85. I believe it was an old carbed engine too. DOE did some testing in a Diesel engine converted to a one cylinder and tested both Ethanol and Methanol. The test engine was ~19:1 Static compression ratio. There is a study on E85 that used another one cylinder engine, Direct Injection, and static compression ratios from 9:1 to 13:1. Needless to say, E85 was fine at any ratio while Premium Gasoline was knock limited.
It's hard to find an off the shelf set of pistons to go as high as you're talking. But it depends on the engine. I have heard of a few builds that used moderate compression with turbocharging. We're talking 12:1 up to 13.5:1 on 2.0L Honda engines.
Pre-ignition/knock/detonation is public enemy number one.
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-Allch Chcar
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