A pure stoichiometric mixture is most easily obtained by water electrolysis, which uses an electric current to dissociate the water molecules:
electrolysis: 2 H2O → 2 H2 + O2combustion: 2 H2 + O2 → 2 H2O The energy required to generate the oxyhydrogen always exceeds the energy released by combusting it. (See Electrolysis of water:Efficiency).
yeah, sure it says the energy to produce the HHO is higher than the energy generated by HHO, but what if the energy required to produce it comes from wasted energy? basically you're getting something from nothing (something productive from something wasted)..