A little googling tells me that the "km/L" conversion is equivalent energy use, not an indication of actual gas usage. It's a pure-hydrogen engine.
http://www.google.com/search?biw=128...=Google+Search
http://www.imrt.ethz.ch/pac-car/
http://www.azom.com/details.asp?newsID=3197
I want one. And a hydrogen fueling station to go with it.