2013 BMW 6-Series
 

http://images.thecarconnection.com/t...00373226_t.gif Looking from the 640i and 650i Coupe and Convertible models, over to the all-new, very curvaceous Gran Coupe four-door, and to the super-performance M6, the 6-Series lineup appears wildly varied in purpose, and appealing to distinctly different kinds of luxury-car shoppers. But across the entire 6-Series lineup, what these models do...
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