“fact that diesel cars are usually more efficient...” is true if compared to a gasoline combustion engine. But there is no simple comparison on efficiency between the 2 different technology battery vs gasoline.

My take is the other way. Loan several billion dollar to any of the big three is not doing much. The cash burn rate they have will eat the money quickly and just to survive. Since the first oil crises in the ‘70 any of the Detroit companies had lots of time to spend R&D money on alternative power train solutions. They decided not to do a lot for multibillion dollar revenue companies other than building bigger and bigger SUVs. Japanese car manufacture by now have some lead in hybrid and battery technology and a small company Tesla has in my opinion a better chance to compete in this segment.