The video seems genuinely from Toyota, and like GDR's video it says it uses electrolysis to create hydrogen, but given that contradiction it's unclear what technology they're talking about.
I suspect this is an elaborate prank.
I don't think the math works and I cannot imagine the engineers at Toyota would fall for a perpetual motion scheme like this. Is the hydrogen fuel fed to the engine in a gaseous state or liquid? At STP the hydrogen will take up considerably more volume than the water.
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