Air and Gas combination car a real possibility?

I was reading a story over on CNN that was very interesting.  It was all about a air/gas car that could get 106mpg.  It is a former french race car engineer’s invention.  It has recently been licensed by a US firm for possible production by 2010.  They hope to have a model that could get 106 mpg and seat 6 for less then $18000.  There are some questions on the possibility of a 6 seater getting that good of mileage, but if it is even slightly possible, it would be REALLY impressive!  Could make us consider getting a new car a lot sooner I guess if they triple the mileage possibilities for that kind of price!