I've read where some accuse Stan Meyer's HHO dune buggy to be a vehicle of this sort, running at a deficit on electrical consumption.
Why do you manage to mention known criminals in your threads, Stan Meyers was convicted and is currently in prison for defrauding investors with his water4gas scam.

Maybe you could actually find a non-criminal scam artist to refer to. Oh yes I forgot there is not one in the HHO community. Because nobody has any real proof there kits work as claimed.