It is no longer a theory for me, hho needs no outside oxygen to run an internal combustion engine and you can use it as a stand alone fuel. Checkout this link
https://www.youtube.com/watch?v=80MrmtnmbMQ&t=101s look at 4:40 on the timeline and you will see the difference between the engine running a mixture of hexane and hho and hho by itself.
The purpose for this experiment is to show how hho can be mixed with any fuel and act as an oxidizer (oxygen) for that fuel with no need for outside or ambient air.