[dzhiurgis]

How come fuel cell cars have tanks holding like 10kg of liquid hydrogen?

[salty_biscuits]

Because fuel cells are very efficient at turning fuel to electricity, especially compared to an ICE.

[imtringued]

Because hydrogen is the energy densest fuel by mass, but not by volume.

[anonymouskimmer]

Nitpick: It's typically compressed hydrogen for cars.

[TylerE]

That's not ICE.