Gas-guzzler commonly refers to a vehicle that consumes fuel inefficiently. The term originally came into use in the US when congress established Gas Guzzler Tax provisions in the Energy Tax Act of 1978 to discourage the production and purchase of fuel-inefficient vehicles. The gas guzzler tax had applied only to cars (not trucks) and was collected by the IRS. Ironically, today the term's often used to refer to SUVs or other semi-large vehicles that qualify as "light trucks". Nevertheless the t… (More on Gas-guzzler)