Wrong. The sun uses hydrogen as a fuel and converts it into helium through nuclear fusion.
You are wrong. "Fuel" is your sentence is just a metaphor. Toyota is not proposing H1 fusion. We cannot yet create a sustained H1 fusion, nor even a sustained deuterium-lithium fusion, which has the lowest energy threshold.
Stop talking about fusion, people. This is not about fusion. This is a fuel cell, which is a technical term, and does not mean that hydrogen is really a fuel, in the same sense gasoline is. It is not.
I’m sorry, when did the subject shift from automotive technology to astrophysics?
In the context of this thread, hydrogen is NOT a fuel. It is an energy transport medium. If we could _find_ free hydrogen in (or convertible to) a suitable form, it could be considered a fuel. Alas, it takes more energy to produce/release the hydrogen we need in a practical form than we get from using it, so it’s just a mechanism for storing & moving energy.
That’s only relevant if that hydrogen can be plucked out of the air with a giant air scoop for fuel. What’s the source of the hydrogen used in the car?
No! You’re wrong!!! (grin)