Greenleaf's right. Back in college, we tried to 'investigate' this water-as-fuel phenomena (that was back in the 80's), and yep, splitting those molecules require much more energy than what double atoms of Hydrogen would give.
Still, an inventor from Asia (I think it was from the Philippines or Vietnam) used water to somehow "dilute" gas and make it still effective. It's not water per se, but water as a fuel additive. It was effective and true, but their government, being the third world country it is, didn't support the inventor. Sad, sad, sad. :p
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