Gas Guzzler Tax An additional tax on the sale of vehicles that have poor fuel economy. Investopedia Says: A vehicle is subject to a tax if it gets less than a certain number of miles per gallon. This is one of many reasons why you no longer see car manufacturers producing 1970s-style, gas-guzzling, oil-burning, road-crushing beasts. Related Terms: Corporate Tax Income Tax Luxury Tax Sin Tax Taxes |