You can't burn hydrogen in an ICE. If you don't liquidify it there is barely enough room for a driver, and if you do as you've mentioned it boils off all on it's own. Stupid
And if you do fuel cell by the time you've done all those phase changes and had all the losses along the way, unless you're greating the hydrogen with 100% renewables you're going to be worse off than just burning dino fuel.
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