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Uses hydrogen (H2) not water (H2O), again H2 has to be split from O with energy somehow.

I edited and added some videos on HHO systems. It's a demonstration of splitting the H2O on the move rather than carrying a gigantic tank of liquid hydrogen.

You're describing an 'infinite energy' device. The Cummins link does not support your claim, no credible firm or engineer will claim to be able to do this.

The maximum amount of energy you can get out of combining hydrogen and oxygen is exactly the minimum energy required to split water into it's components.

its components.

This is physically impossible perpetual motion.

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