[shovel]

I don't think the "well manufacturers of cars aren't doing it so that means it doesn't work" argument - which is valid elsewhere, applies to HHO simply because an enormous demographic of end users can barely be bothered to keep air inside their tires or take action beyond "turn up the radio" when their car starts malfunctioning. This demographic would be utterly mystified and boggled by an idea like "wait I have to put distilled water in this hole and gas in that hole?" ... what happens when they put gas in the water tank? What happens when SnakeOleum Ltd. releases their "MAGIC HORSEPOWER IN A BOTTLE HHO ADDITIVE!"...

I doubt a manufacturer wants to get within 100 yards of that mess. Even if HHO would kick ass in practice.. on which I have too little hard data to form an opinion.