It is difficult to arise at a stoichmetric ratio betwen fuel and gasoline when the alcohol is at a fix ratio to fuel (it can be calculated).
At rich air fuel ratio, all liquid acted as a coolant when oxygen is fully consummed. But at lean air/fuel ratio, alcohol becomes a high octane fuel rather a coolant.
We need to define what portion of fuel is used for combustion across the plot, with the exception of water, air/fuel/methanol is still any unknown variable.
I suppose the details doesn't really matter as long as it produced a repeatable result.
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