Read the full feature at: robbreport.com/Paid-Issue/On-a-Roll BMW is enjoying the most profitable period in its 96-year history, and good fortune has little to do with that success. The company has been refining a winning formula with its 3, 5, 6 and 7 Series automobiles for decades, and more recently with its 1s, Zs, and high-performance M cars. The latest examples of that refinement are the 2013 M6 Convertible and 640i Gran Coupe.

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