Incidentally, the volume of air required to ideally burn a litre of gasoline is also quite large.

http://en.wikipedia.org/wiki/Gasoline#Energy_content

1 kg of fuel reacts with 3.51 kg of oxygen to produce 3.09 kg of carbon dioxide and 1.42 kg of water

Scaling that to the standard density of 0.755kg/L, that means 2.65kg of oxygen for 1L of gasoline. Assuming the typical 20% oxygen content of air at standard temperature and pressure, that is over 9000L of air.

So the air consumption of a car with fuel consumption of 0.1mm^2 is 0.0009m^2 or 900mm^2.

Edit: 900mm^2, not 900000.