Citation needed. Source? Is or is not the process in mass industrial adoption?

If hydrogen were convenient and economic to produce and use as fuel, economics, which drives fuel choices, would have driven mass adoption of hydrogen motor fuel. However it is a storage medium and energy to produce hydrogen isn't free.

If you want, buy a cylinder of the stuff and try it yourself. Your local welding supply will happily order it. (You will also note the weight difference between a DOT-approved high pressure industrial gas cylinder and the light petroleum gas tank...)

Here's how hydrogen is already produced in vast quantities for its many industrial uses:

http://en.wikipedia.org/wiki/Hydrogen_production