Water-Fuel Carin Japan

What a misleading, bold faced lie.
Water alone will not run a car. From the newsclip, they imply that Hydrogen (H2) is extracted from the water in order to power the car. This implies that they add energy to the car (probably electricity) to do this extractions since the hydrogen bond is very strong. This means that something from the outside is added - electrical energy. This car does not run on water alone, it runs on water and a lot of electricity. They should say this instead of hiding the fact.
Most likely, the H2 is extracted from the H2O via a fuel cell based electrolyzer and then the H2 is converted to electricity via a fuel cell (while combining with atmospheric O2). While what I describe is feasible, this is just a typical Fuel Cell Electric Vehicle (FCEV) with the usual problems:
- the electrolyzer and fuel cells are very expensive
- it takes a lot of electricity to go very far
- it takes a long time for a reasonable sized electrolyzer to extract the H2 from the H2O

Eco-D,
You may know that external energy (presumably electricity) is required to run this car, however, the video does not state this at all and I know of many relatively intelligent people who missed this fact when the Fool Sell scam was used to kill the California ZEV mandate.
Additionally, smaller does not necessarily mean less energy. It takes a certain amount of energy to split H2O into H2 and O2 and a certain amount of heat is released. Likewise, there is an amount of heat that is released when the H2 and O2 again recombine in the fuel cell. Unless this system finds a way to recover this heat, much of the electricity used to electrolyze the H2O (approximately 75%) is wasted in heat through both parts of this process.
Using an ordinary Li-ion battery to store the electricity on board is much more efficient and economical. The Li-ion battery only wastes about 20% of the electricity to accomplish the same thing.
You're welcome to espouse this technology. Just don't tell me I didn't warn you it was a scam.