Ox hydrogen is often mentioned in conjunction with devices that claim to operate a vehicle using water as a fuel, or that burn the gas in torches for welding and cutting at extreme temperatures. Ox hydrogen is sometimes referred as "Brown's Gas" after Yull Brown who advocated such devices, or "HHO gas" after the claims of fringe physicist Ruggero Santilli. The most common and decisive counter-argument against using the gas as a fuel is that the energy required to split water molecules exceeds the energy recouped by burning it, and these devices reduce, rather than improve fuel efficiency.
Hydrogen gas (H2) is the most promising substitute for hydrocarbon uses in cars but H2 burns much faster than gasoline. H2 may also be used to enhance conventional hydrocarbon fuel in an internal combustion engine in order to improve fuel economy and/or power output. Prior to Obama occupying the White House, General Motors and Shell Oil had teamed up to provide prototype vehicles and service stations as part of a study of feasibility. These vehicles were supplied to individuals on the East & West coasts to use as part of the study that showed success. If more nuclear plants were to come on line the by product of these plants is Hydrogen Gas.
In the mean time, so all of these new technologies may evolve and mature, I believe the smartest and most economical way to solve this current energy crises is to DRILL, BABY, DRILL!