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Probably redundant, but why should we expect HHO systems to do anything?
1. Our engines and computers should be designed to be optimal for burning gasoline, not hydrogen. If they were better at burning hydrogen, why wouldn't manufacturers realize this and redesign engines so they're actually best at combusting gasoline and not hydrogen?
2. As I understand it, this idea is this: Combust gasoline -> mechanical work -> electrical energy -> break chemical bonds in water -> reform chemical bonds to create water in the combustion chamber -> mechanical work
Every step added will have losses involved, why not just take the mechanical work you get from burning the gasoline and cut your losses?
3. HHO systems that are available make minuscule amounts of hydrogen. Unless there's some weird chemistry going on in the combustion chamber (see #1), any gains or losses should be small enough to disappear into background noise.
Maybe there are engine designs that would work better with a hydrogen-gasoline mix, but current engines were designed to burn pure gasoline. In the case of those hypothetical engines, you probably still wouldn't want a HHO system because of the conversion losses, you would want a hydrogen tank filled at home where energy is relatively cheap.
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