Ethanol requires a different A/F ratio. So if you just put pure ethanol in your tank, you will run very very lean, and probably knock.
Otherwise I can't explain it.
Here are the octane ratings of a few common chemicals:
Checmical / RON / MON
(The octane number you see in the US is [RON + MON]/2)
Ethanol / 129 / 102
Methanol / 133 / 105
Iso Propyl Alcohol / 118 /98
MTBE / 116 / 103
Toluene / 124 / 112
Meta Xylene / 164 / 124
Dicyclopentadiene / 229 /167
All of these chemicals can be harmful to your engine in excessively high concentrations. Small percentages (30% or less) of Methanol, Ethanol, or Toluene, are generally considered "safe"
Adrian~
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