I drove 1800 miles in a Hydrogen Car

Producing green hydrogen using the electrolysis of water is a very expensive and inefficient process. It takes 30% of the power you get out of the hydrogen to power the electrolysis process. It then takes another 15% to compress the hydrogen to 10,000 psi which is needed to be able to pack a large enough quantity of hydrogen into a car's tanks to give it a reasonable range. This is one of the reasons Mr. Musk calls them fool cells.