None are close to market. Liquid hydrogen, my favorite, is still in the running. It is hard to know how serious these projects are even though a billion dollars will have been spent by 2000 July. It is prudent for the car companies to keep the Government appeased, and they also must hedge their bets against the possibility that governments world-wide will really force people to accept very low performance cars. None of them shows much sign of competing with the gasoline powered internal combustion engine at less than a very substantial multiple of present fuel costs.
Some schemes plan to get their hydrogen by reforming gasoline on board the vehicle.
There is a chance of a slight increase in efficiency. The article ends with In time, we are likely to see an infrastructure for delivering hydrogen for fuel-cell powered vehicles. The result will be a more efficient, clean transportation sector, a reduction in imported oil and lower carbon dioxide emissions. A hydrogen delivery system will be built when it is technically feasible, affordable and necessary. But that point is still some years in the future.