Indeed, but it does so by filling every inch of space. There's no front trunk, and the backseats and trunk are relatively cramped. Further improving on that pit

Indeed, but it does so by filling every inch of space. There's no front trunk, and the backseats and trunk are relatively cramped. Further improving on that pits you against the laws of physics: even if you could, say, safely double the pressure in the bottles, you waste more and more energy - compression is already a big part of the round-trip inefficiency of H2EV. Meanwhile, EV already exist today with similar range - Model S or Mercedes EQS, with something like 90% solar cell to wheel efficiency, and battery chemistries are only getting better.