The Japanese company Genepax has unveiled a car that runs exclusively on water. They even have a working prototype that was showed off in front of the press. They claim that using only one liter of water it can run with 80km/h.
Here's another guy that succeeded in making an engine run on water. He made several hydrogen electrolyzers and connected them in parallel. The gas...
Van Nuys, CA, is the place where hydrogen car fanatics meet every weekend, for about an hour, in a park. There they discuss their HHO boosters, exchange opinions and schematics, but the gathering is not only for that! They also welcome "outside" people, skeptics, who want to touch, feel and smell cleaner burning gasoline and (or) diesel. They can buy some kits or gather instructions on how to build their own hydrogen boosters.
Ronn Motor Company has proven what thousands of amateur energy enthusiasts from around the world keep researching in their garages for years: that it can run a gasoline sportscar (Scorpio) on both hydrogen and gasoline, mixing them on a 30 to 40 percent ratio.