That sould have been hydro powered cars sorry.

I have been playing around with hydrogin generaters for about one and half years they are easy to build they run off of my car battery . I have increased mileage on a 1995 s10 blazer by about 50 + miles to a tank of gas . This can done with very simple things such as distiled water , baking soda . Stainless steel wire , and a container of your choice . I use house hold water filters .
You can search hydo powered cars and find all kinds of different systems you can build at home with low cost items .