Quote:
Originally Posted by freebeard
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?
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Nowadays with VVT, knock sensors, wideband OČ sensors, and many other tricks, there is roughly no excuse for modern spark-ignited engines to not be able to handle gasoline, ethanol, or both mixed at any ratio. Gaseous fuels compatibility shall also not be disconsidered, as it's becoming more common in a worldwide basis.