Before you go and waste money on a system that doesn't work check one out you can build yourself. Check these links out:
http://www.smacksboosters.110mb.com/
YouTube - EletrikRide's Channel
Watch his stuff on youtube it worth it.
The guy (Eletrik) that makes the smacks booster is also on the watercar and hydroxy forums in yahoo groups nearly every night to answer questions.
His plans are all free all you have to do is go to the hardware store and spend about $50. He also builds and sells them too. But he is not out to make money only to provide a service.
Note: this system is a booster it is not intended as a sole fuel source.