"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://gr

"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-e-tron-extended-range-ev-with-wankel-rot/ 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.