Comment by zamadatix

The H70 standard for hydrogen cars is 10k psi and the tanks for it are usually ~140 liters (depending on the particular model), so very comparable in that aspect. They don't generate the pressure, something has to have pumped it into the tank as seen here, and keep in mind they are hydrogen rather than air.

LPG, no - the pressures are much lower (but also still pumped in and significantly reactive).