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Whilst looking up the answer to another question using Google regarding the water output from a normal internal combusted engine powered car, I noticed that - to my surprise - all the top hits were about water powered cars. Cars that run on water are actually a thing apparently!

  • What are water powered cars?
  • How exactly do they work?
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    Water powered cars! What are these things? :-) +1 – DucatiKiller Jan 27 '16 at 6:52
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Simple answer - they are a hoax, and they don't work.

The only way to power a car with water is to electrolyse the water into Hydrogen and Oxygen using an external power source (and it uses a lot of energy to do this), store the Hydrogen in the car and use that (with oxygen from the atmosphere) to power a Hydrogen fuel cell - the output from which is water and energy. Like every other system, there are losses involved, so you always get less energy out than you put in - that's a fundamental law of physics...

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