Nuclear power is the most efficient way to generate electricity. They should work on developing autos with small plutonium batteries similar to the ones used in some space satellites.
Pretty sure that sticking with large scale nuclear power plants that provide electricity to cars (via the grid) would be much better both economically as well as with regard to safety.
Do you really want to have hazmat crews show up every time there is an accident?
The cost of the RTG's used in satellites is astronomical (pun intended), even in mass production they would never be cheap enough.
Hey, I'm waiting for that new Obama model to come out. I hear it is going to be super light weight because of all the hot air they are going to put into it. And, its going to have a big "O" right in the middle of the grill.
Oh, wait a minute. Maybe that was the Edsil. Funny, you don't see those any more.