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Yes, Ethanol is hygroscopic. It's why the azeotrope is only about 98% pure. If you pour a pint of Everclear into a beaker during the Southern US summer, it will change from 190 proof (95%) to some lower value over the next couple of hours as it sucks water right out of the air. It'll also...

Luckily, there's rising awareness that a) ethanol in gasoline is nothing but a sop to corn farmers, and b) that it's bad for anything that isn't fuel injected. Depending on your local environmental regulations, you may be able to fill up with no-ethanol mogas at the pump. It's gotten steadily...