Its not perpetual motion, its extracting Hydrogen from water, takes very little Elec. Can be done and is being done just not as effeciently to run a Full size car down the road (yet).
Monty hydrogen at this time is not easily transported, to much pressure, and to hot a gas. probaly never will be.
A research facility at A&M has been able to lower the boiling point of natural gas in liquid form thus decreasing its pressure while maintaining its "BANG" so who knows. of course theres always the Volitility problem,its a Very hot fuel, Ignites at low tempertures and within a VERY wide range of air gas ratio.
This is why Propane is safer than most folks realize it has to be lite with something Very Hot, (cigarett wont do it, spark open flame- Yes) and has a small range of air gas mixture to ignite, its usally to rich or to lean.