And to what price level will gasoline have to rise before hydrogen fuel becomes comparatively economical?
The last reports I've seen is that presently around $6.00/gallon although once the economies of scale kick in that would drop to around $4.
Hyrdogen is not cheaper than hydrocarbons.
Check out BLPD on stock market.....The are using fuel cells that can use any thing that produces methane, from corn through garbage.
Purdue University recently received a grant to produce the brakes for the cars (a major problem) and most of the major auto manufactures are buying stock (DC, Ford, Nissan, Tyota etc....It's cheap right now, but expected to go up in the next five years)
The state of Michigan gave the company several acres in the Detroit area to build their new factory) They are currently building buses for large cities and have several on back order.
Doesn't matter. The easiest way to get hydrogen for hydrogen cars is to crack it out of gasoline.