Answer: gashog

AnswerCrossword Clue
GASHOGHummer, e.g.
GASHOGFar-from-efficient vehicle
GASHOGUneconomical car, perhaps
GASHOGIt's far from fuel-efficient
GASHOGUneconomical vehicle, slangily
GASHOGFuel guzzler
GASHOGSUV, typically