Elon musk claims that even if you take the same source fuel and burn it into stationary power plants, you're still better off. If you burn natural gas in a mode

Elon musk claims that even if you take the same source fuel and burn it into stationary power plants, you're still better off. If you burn natural gas in a modern general electric gas turbine, you'll get about 60% efficiency. If you put that same fuel in an internal combustion engine, you get about 20% efficiency. So electric cars 'make sense' if this logic is valid. http://youtu.be/IgKWPdJWuBQ?t=59s http://youtu.be/IgKWPdJWuBQ?t=59s I summarized at 59 seconds of this youtube clip you can see his exact claim. Is his claim logically/mathematically sound?^