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Oxyhydrogen as fuel
Oxyhydrogen can be used as fuel in internal combustion engines. However, due to the very difficult storability (although production is easy), it must be used rapidly after production. In addition, besides dissapating after a while, it also degrades (reverts to hydrogen) very rapidly (ie after 1 to 2 hours).. The latter reduces the energetic level by 400%.
With a Bob Boyce electrolyzer (see http://pesn.com/2007/09/29/9500450_BobBoyce_Electrolizer_Plans/d9.pdf ), a gas output is produced which has a much higher energy output than the energy that was needed to split the water in the first place.
Oxyhydrogen boosters are popularly used in vehicles, mostly in combination with another fuel (ie gasoline) to decrease costs/km in terms of fuel expenses. These are however offcourse not full oxyhydrogen systems. Some full oxyhydrogen systems however have also been built into vehicles.