Question: Why no e85?

[Evolution1980]

With e85 providing better performance, especially in boosted vehicles, why hasn't GM made the cars flexfuel capable? More specifically, why not have the ZR1 be capable of running e85 which would provide notable power increases over 93 octane gasoline? I can't imagine it's due to reduced mpg. If you're driving a Corvette, ya probably don't give a rat's ass about squeezing out extra miles per gallon. You're already paying a Gas Guzzler tax, so it ain't that.