Wait...What???
(media.greatawakening.win)
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For internal combustion engines, largely yes. But they come from distilled petroleum, which is much easier, cheaper, and safer to produce.
Yes. Water is not combustible. For the hydrogen to be combustible in water it needs to be removed from the H2O. To remove it from the H2O it requires a large amount of electricity (or similar). If you've got that much electricity, might as well just power a motor.
No, water does not combust under earthy reasonable pressure. A pure water engine as science exists now is totally impossible. The only "water" engines I've seen require separation of the molecules. To make it happen efficiently a method of seperating hydrogen from the oxygen without more energy than just powering an electric engine would be required.