Compressed hydrogen works, and is available in a number of fueling stations around the country. Few of these stations are in urban environments, however, because of concerns about leaks of free hydrogen.

The cost of compressed hydrogen is almost twice that of hydrogen generated on board vehicles from HYDRNOL. This is due to the energy that must be expended to compress the gas in the first place, and the cost to store and transport it in special tanks and vehicles.

Comparing the on-board volume and weight for the hydrogen and the pressure vessel gives a distinct advantage to HYDRNOL. Also, the cost of the tank for HYDRNOL is much lower, since there is no pressure vessel required.