
1) Big wheels, often 2) Car with poor mileage 3) Hardly economical transport 4) Low-mpg car 5) Many an SUV 6) Politically incorrect car 7) Politically incorrect vehicle 8) Slang for an uneconomical car 9) Vehicle with poor mileage
Found on
https://www.crosswordclues.com/clue/gas-guzzler

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...
Found on
http://en.wikipedia.org/wiki/Gas-guzzler

Gas guzzler is slang for an uneconomical car.
Found on
http://www.probertencyclopaedia.com/browse/ZG.HTM
noun a car with relatively low fuel efficiency
Found on
https://www.encyclo.co.uk/local/20974
No exact match found.