Could you please explain how the process described in post 83 this isn’t a viable theory? It sounds more than reasonable to me, similar to adding nitrous.
Nitrous oxide is stored as a compressed liquid; the evaporation and expansion of liquid nitrous oxide in the intake manifold causes a large drop in intake charge temperature, resulting in a denser charge, further allowing more air/fuel mixture to enter the cylinder. The lower temperature can also reduce detonation. The gas itself is not flammable, but it delivers more oxygen than atmospheric air by breaking down at elevated temperatures, allowing the engine to burn more fuel and air and resulting in more powerful combustion. Also, Nitrous Oxide does NOT save fuel but rather combusts much larger quantities of it. It provides more power, not better economy.
In adding 2H2 and O2 in a ratio the consumes all the additional oxygen with the additional hydrogen, no additional combustion takes place of the fuel. The low specific gravity of hydrogen means a fuel less dense per volume space is displacing gasoline, a fuel that contains more energy be volume space at the pressures of the intake cycle.
Hydrogen does contain more energy per pound. But to get the energy per cubic inch equal to gasoline takes pressure to large for use in a standard engine.