[henrikschroder]

> literally a car running on water.

No, your car would run on electricity.

But why would you want a car that takes electricity and charges up an internal hydrogen fuel tank, then uses that to fuel a combustion engine, when you might as well have an electric car where you fill up the battery, then use that to power an electric engine.

The fundamentals of a car don't change. You need to store energy in the car somehow, and you need to convert that energy into movement somehow.

The benefits of a regular car is that the "store energy in car" part is very easy. You just fill it up at the gas station. The benefits of an electric car is that "convert to movement" is very easy, because electrical engines are very simple.

I completely understand that if you have a fueled up hydrogen-powered vehice, it's awesome - it runs on water!!! - but what do you need to do to get there? And how much energy is lost in conversions along the way? It simply doesn't solve any problems in a better way.