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...look up "galvanic reaction" with dissimilar metals and what the result is; hint (pitting, corrosion, metal transfer, etc.)...and a conductive medium (ethanol) is the catalyst.
...gasoline is basically neutral, but ethanol is not, it's conductive.
...also, just for giggles, also look-up "electro-plating" and what the mechanisms needed for it to occur are.
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