Fuel Your Car with Water... Fact or fiction?

I really don't know if this is a scam ... but the video is rising fast on Youtube and I bet a lot of people will be fooled if it is.

As far as I know, the process of extracting hydrogen from water is extremely complex and requires a lot of energy in itself... meaning, a water-powered car while theoretically possible is simply too inefficient to be feasible.

So, has someone finally cracked it? (Yes, I know Daniel Dingle has been touting his water-powered car since 1968 -- but for some reason, I always thought it seemed fishy. In the same way that I think this Japanese one is fishy.)

However, I sure hope I'm wrong though!