MJM,what happens is the ethanol reaches a saturation point(its maximun absorption of water) and settles at the bottom of your fuel tank.That is where it gets picked up and put into the engine causing damage.It isn't as big a problem for automobile because of the change over of fuel(how quickly you burn a tank of fuel)and auto manufacturers still recommend upping how offten you change your fuel filter,if you go too long you'll find a grey mucus like substance it the filter which is the saturated ethanol
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