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Pure premium has specific combustion properties that can be tuned for, pure ethanol also has specific combustion properties. Which can be taken advantage of by increasing compression ratio and adjusting the timing.
I can see how an advanced engine might take advantage of one or the other on the fly. But when they are mixed together?
This used to be called 'neither fish nor fowl'. 14.7-1 sounds like the optimal stochastic ratio.
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