So, how efficient would an H2 enriched gasoline engine be? For the sake of easy math, let's say that you improved the thermal efficiency from 26.5% to 40% (about 50%, quite a feat!).
Let's say that your HHO generator is 60% efficient (that is, the energy utilized to make HHO versus the chemical energy of H2). And 60% is probably a
extremely generous figure for a homemade underhood system with no active electrolyte control and cheap electrodes. (Some of the best industrial electolysers
are running at ~80%. But please feel free to check my 60% figure here... there's a reason why >90% of the world's hydrogen production is accomplished by cracking fossil fuel rather than water.)
So, do you really think that the losses involved with producing HHO will be outweighed by the efficiency gains? The numbers above don't seem to give me much hope of that.
Again, I'll help someone design a bottle-based system. I've already figured out the control logic and most of the parts.