Originally Posted by BadNick

One strange example of a car that does consume gasoline for heating the inside of the car is the VW 411/412. I had a 412 years ago, I think it was a 1973, and it had a gasoline fired heater for cabin heat. So you can actually hit a button and heat the inside of the car before even starting the motor; this heater burned gasoline from the gas tank and heated the inside air (indirectly in an air-to-air heat exchanger); in that case, heating did consume more gasoline ...weird car that was.