[Kaio]

God damnit, the electrolysing doesn't happen while driving. It happens when you're "charging" the vehicle so you won't really been doing it unless you're home. Your car isn't really running on the goddamn water as people have pointed out.

It's probably going to run a hydrogen combustion engine or a hydrogen fuel cell.

With that said, electric prices are far cheaper then gasoline. Most pure electric cars seem to cost 1/5th or less per mile. So even if this process uses more energy then gasoline combustion engines (which have a pretty low energy efficiency) it may still cost less.

The ONLY reason this could be practical is for storage reasons. This is not a method of energy generation but storage. It's benefit is that a tank is far cheaper then even a nimh battery (2-3k for a prius) and li-ion battery with this much energy potential is probably going to be 10x that amount. The chevy volt's 40 mile range battery (don't remember the kw/h's it holds) costs more then 20k for reference.

Edit: I just read the second article, it's written poorly and probably inaccurately. They seem to always fuck up tech article because they don't know what questions they need to ask.