Water4gas

Okay, time to bring out my inner geek, and have him team up with my outer geek to bring this to a swift conclusion. HHO...Brown's gas...whatever they'll call it, as it's an electrolytic product of water, it will take more energy to produce than combustion of the resulting components will yield. When you use hydrogen(or anything else) as a fuel, combining with oxygen to yield various oxides, the resulting products are lower in energy than the starting components. This is why combustion happens. In the case of hydrogen (H2) combusting with oxygen (O2), you have 2H2 +O2 = 2H2O, where water is the lower energy product. The release of energy is what makes the combustion a spontaneous and self-sustaining process until either the oxygen or hydrogen is exhausted. So, more energy is required to make it than burning it releases. This would mean that your electrical system would have to provide the extra energy. On the other hand, if you generate the hydrogen outside of the vehicle, using solar or wind power(or wall current, it's cheaper than gasoline, afterall), to electrolyze water, it could be a cost-effective system. The folks at united nuclear: www.unitednuclear.com have been working on hydrogen conversions for a while, and are currently at an impasse due to regulations on materials necessary for the safe storage of hydrogen gas. But, it's worth a look. Hopefully we won't have anyone maimed by an exploding mason jar full of hydrogen...