it is actually questionable whether ethanol is actually better. it takes a lot of energy to produce and transport. some studies actually have it being worse than gasoline.
It does reduce knock though (I don't know what percentage it requires for that). It just couldn't be patented so we drove a few generations of people to unhinged criminality instead.
it is even questionable within corn-producing areas, if memory serves. there are a lot of energy inputs just to grow a crop, then you have the energy of converting it to ethanol.
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