Spoiler:

@ 20:14 " So I think we've busted the amount of power that we needed to drive the electrolytic cell is almost equivalent to the power output of the engine. We didn't get really any increase in power and the amount of fuel that we used over the same period of time means that the total energy output from the engine is unchanged. So it's busted. These devices cannot work in theory, they don't work in practice, save your money, don't purchase them. Hopefully you found this interesting "