Actually it would be compressed air -- running a car that emits an exhaust of cold air.
Sound fantastic? Or maybe a little too fantastic?
According to Zero Pollution Motors, they will begin taking orders for a $17,800 Air Car in mid-2009, with deliveries expected in 2010. The Air Car is expected to have a top speed of 96 mph, getting 106 miles per gallon (of compressed air).
While Zero Pollution Motor's first model is expected to be the 13.4 foot long, six-seat Air Car -- we decided to post an image of their concept car, the AIRPod Urban Transporter. It looks to be a cross between a Smart Car and a GM/Segway. Pretty cool!