50/50 E-85 and 92 octane

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50/50 mix for over a dozen tanks. i can tell a difference between regular 92 octane gas and 50/50 mix on the SMIC BIG time. Pulled like crazy, when it was normal gas i would heat soak and knock. Could feel the car pulling timing. After i threw a FMIC on the car and the car drives like a dream. No timing pulled, and even wanted to attempt the above mentioned idea on E-85. But with no fuel mods it'd be just asking for a blown motor.