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Re:Tesla model S eliminates range anxiety by maigret on Tuesday August 28, 2012 @01:17PM (#4444790)
"why don't they" -> Remembers me of a recent HN discussion ;)

But... Actually you are not far from something. This is actually an approach from Audi: http://green.autoblog.com/2010/03/01/geneva-preview-audi-a1-... From what I read though this approach was not approved in the mother company, VW. Let's see who wins at the end.

Re:Tesla model S eliminates range anxiety by Gravityloss on Tuesday August 28, 2012 @06:24PM (#4446183)
That's very interesting, what Audi was planning! The Wankel engines are quite expensive though.