I haven't even seen ads that claim that it improves mileage without being extreamly vague, or by trying to confuse people that might not understand what they are selling buy using weird terms instead of being straight forward.
I've made hydrogen, I've used a $6,000 hydrogen generator that ran a torch, I've seen engines run off hydrogen, the amount of energy needed is great, the amount of hydrogen produced is very small.
So far all of the gains I've heard of could be attributed to the placebo affect, if the gains were real then you should be able to turn on the electrolysis set up while going down the highway with cruse control on and see a change on an instant mpg read out and from what I have seen no one can do that.
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