No.
Rolls-Royce is a very diversified company and automobiles are not the largest part so I don't know why that came to mind.
It is "micro" only compared to a full scale nuclear power plant.
Why would a car need a pressurized 1-10 MW power plant albeit a relatively tiny 10' x 4' in dimension? Besides not needing the power, the cost would be enormous at $50M each.