From Longman Dictionary of Contemporary Englishgasoholgas‧o‧hol /ˈɡæsəhɒl $ -hɒːl/ noun [uncountable] American EnglishTTC petrol with a small amount of alcohol in it, which can be used in cars and is cheaper than petrol
Examples from the Corpus
gasohol• Alcohol is usually added to petrol to form a mixture called gasohol.Origin gasohol (1900-2000) gasoline + alcohol 