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As a sporty vehicle in the SUV segment, the Porsche Cayenne has been challenging automotive conventions for over a decade. Four new 2015 versions, the Cayenne Diesel, Cayenne S, Cayenne Turbo, and Cayenne S E-Hybrid, promise to expand upon that legacy.  Photo 2 of 8 in New Porsche Cayenne Editions Promise Greater Efficiency Without Compromising Performance