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2011 Porsche Cayenne Diesel

  • Porsche Panamera Diesel

    Introduced for 2010, the Porsche Panamera horrified purists but lured buyers all over the world. It was Porsche's first-ever four-door sedan, built in part for the burgeoning Chinese market, and its humpbacked styling is ... well, let's just say ... polarizing. Now Porsche has unveiled the most fuel-efficient Panamera yet, a clean diesel version that achieves a remarkable 37.3 mpg on the European cycle when fitted with low-rolling-resistance tires (and about 36 mpg without them). It also comes with a standard start-stop function, to switch off the engine while the car is stopped. (Note that...

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