I am no expert by any means but countries like Brazil have been almost soling using ethnol based fuels for many years before north america without problems (with the exception of cutting down the rain forest to grow sugar cane for fuel). Ethanol is supposed to burn hotter for a more complete combustion with less residue so I doubt that it would harm your engine any more than any other fuel. As far as being "greener" I read an article in National Geographic not too long ago that the process for creating ethanol in N.A. uses about a gallon of fossil fuel to create a gallon of ethanol because of the plant types we use. Places like Brazil use sugar cane that has a much higher ethanol yield compared to corn that has a very low yield. So well your car may be polluting less the ethanol factories are making up for it. My 2 cents!
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