I think the safe thing to do is assume that the ethanol is there.<br /><br />All pumps up here now have a sticker reading 'contains 10% ethanol'. I've always actually assumed some percentage of ethanol has been in our gas for years, since I never see any water from my gascolator (alchohol absorbs water). I don't have time nor the desire to test my gas for ethanol each time I go to the pumps....especially in the winter. <br /><br />I feel bad for the certified plane owners with their autogas STC's, which prohibit any alchohol. (a little, anyway). The airports with plain mogas are few and far between up here.