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Jason, nobody has really done a proper job of it. There have only been allegations of success done in private, and you need somewhat sophisticated equipment to even have a hope of sorting it out (i.e. a peak pressure transducing spark plug and etc) plus complete control of injection and ignition.
Then you are still saddled with another tank or two to top off and keep unfrozen for what looks like a marginal gain compared to other efficiency mods (i.e. adjusting the nut behind the wheel) which marginalize the theoretical gains of HHO further.
TL;DR; Unproven, inconvenient, expensive, better solutions exist.
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