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The effective theory behind the HHO generator is basically the same for water injection, methanol injection, ethanol, pure hydrogen, etc. It's that anything added to a gasoline combustion cycle will improve the efficiency. Unless you're adding large amounts, aka enough to actually displace the gasoline used, it's probably going to improve efficiency up to 10% on average. I've heard reasonable suggestion that 25% is possible, but that would be more than altering the gasoline burn and you'd need a groundbreakingly good electrolysis system to get that from a HHO generator. There are people who build and test HHO generators as a hobby/research too.
Typically the injection of another fuel provides a cooling effect. Tuning your engine for the benefit means; better at getting w/e you want from it. Leaving it to it's own devices is not a good idea. You have to compensate for the injection. They didn't build it to accept HHO from the factory aside from the Scorpion. 40% improvement is pretty radical for a HHO generator. That's got to be supplementing on the fuel.
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-Allch Chcar
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