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While you can't replace gasoline with hho, you can supplement it creating a hybrid vehicle and increase gas mileage to a minute degree. It does work, but you have to use better methods than what those backyard yahoos are trying. There's a lot of research being done on the private level with this technology, but it's going to take a lot more developing to get worthwhile gains from it. Up to now the old theory "you can't get more out than you put in" stands true. If you google "Stanley Meyer", you'll find he has developed technology to achieve worthwhile energy gains from hho - he holds several patents with this technology.