MIT School of Engineering » Why can't cars run on water instead of gasoline?

It has been proved that a car can run on water too, then why don't we start manufacturing cars that will work on sea water as we have plentiful of it?

Can hydrogen fuel cell vehicles destroy the water resource of the planet Earth? - Quora

Salt water-powered electric car prototype approved for roads in Europe

New Breakthrough in Energy Storage – MIT Engineers Create Supercapacitor out of Ancient Materials : r/technology

Why would the government want to eliminate someone who has found a way to run engines on water instead of gasoline? - Quora

Can methanol be used as fuel? - Quora

Water fuel cell - Wikipedia

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Can Cars be Made to Run on Water?

A water-powered car still requires other forms of fuel to work; it cannot run solely on water, contrary to viral Facebook video claims - Science Feedback