I don't know, energy doesn't need to be that unstable, hidrogen fusion gives a lot of energy and don't need much mass of it, not more than current fossil fuel m

I don't know, energy doesn't need to be that unstable, hidrogen fusion gives a lot of energy and don't need much mass of it, not more than current fossil fuel methods. PS.: Of course no fusion reactor that fits in a car will probably de developed in the next years