The BMW Hydrogen 7 has successfully completed an eight-week test period. During the test period, NASA personnel had full access to the fleet of BMW Hydrogen 7s, which run on a form of liquid hydrogen similar to what NASA uses in its shuttles. During their time with NASA, the vehicles - which feature a dual combustion engine capable of running on liquid hydrogen or gasoline and shifting seamlessly between the two - were conveniently refueled using the space center's liquid hydrogen fueling supply located on the space center's premises.
http://www.technologynewsdaily.com/node/7683