Maybe they should instead use the cars to mine Bitcoin or altcoins when they drive around using a lot of energy, did you know that %80
Of the energy used to move a car is practically wasted and turned into CO2? even the electric cars most of their electricity is wasted on
Moving all the mechanical parts.
Anyways, blockchain without the decentralization and hashing concept is just a simple database.
To me this does not make sense, of course there is wasted energy, it is almost impossible to create a machine that uses 100% of the energy that is put in it, even the human body wastes a significant amount of the energy that you consume as food, that is just physics, the laws of thermodynamics are almost absolute in this universe.