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Porsche has definitely been testing diesel-powered versions of the Cayenne SUV as evidenced by the recent spy shots of on filling up from a diesel pump in northern Sweden. However, that doesn't mean the Stuttgart-based high performance manufacturer has definitively decided to actually produce such a beast. Klaus Berning, Porsche's head of sales and marketing has said that a diesel Cayenne won't come to market unless it can be a sales success in the U.S. market. So far, there have only been a han