This is the BMW tank I got those figures from which looks to be manufactured by Air Liquide [1]: "To stay a liquid, hydrogen must be cooled and maintained at c

This is the BMW tank I got those figures from which looks to be manufactured by Air Liquide [1]: "To stay a liquid, hydrogen must be cooled and maintained at cryogenic temperatures of, at warmest, −253 °C (20.1 K; −423.4 °F). When not using fuel, the Hydrogen 7’s hydrogen tank starts to warm and the hydrogen starts to vaporize. Once the tank’s internal pressure reaches 87 psi, at roughly 17 hours of non-use, the tank will safely vent the building pressure. Over 10–12 days, it will completely lose the contents of the tank because of this" At that temperature even sloshing around adds enough energy to heat and cause venting much sooner another reason its not great for mobile use. Looks like Air Liquide made a different one that you are quoting perhaps an improvement, still high vacuum double walled, so you lose all your fuel in a month instead, thats progress. This shows liquefaction to be about twice as energy intensive as compression (1.3 vs 3.4 kWh/kg theoretical 6 vs 13 kWh/kg actual) [2] So please point me to better info. 1. https://en.wikipedia.org/wiki/BMW_Hydrogen_7 https://en.wikipedia.org/wiki/BMW_Hydrogen_7 2. https://www.hydrogen.energy.gov/pdfs/9013_energy_requirements_for_hydrogen_gas_compression.pdf https://www.hydrogen.energy.gov/pdfs/9013_energy_requirement...