[templar]

... and the refueling process is only slightly less dangerous than using a blowtorch to find your way around a fireworks warehouse

Haven't heard that before, could you expand a bit? It seems to me that it would be less dangerous than propane.

[steveegg]

I exaggerated slightly, but not very far. The low-mileage hydrogen cars have their hydrogen systems pressurized at 5,000 psi, while the more-"promising" hydrogen cars have the hydrogen at 10,000 psi. Propane is pressurized to roughly 300 psi, while compressed natural gas is pressurized to roughly 3,000 psi. Somehow I doubt that the self-service refueling station will be around much past the widespread introduction of hydrogen.