Porsche's first diesel engine for the U.S. market makes its debut in the 2013 Cayenne SUV. With an estimated 20/28/23 mpg city/highway/combined, the Cayenne Diesel should get 21% better fuel economy than a base Cayenne with a gas V-6 and an automatic transmission. It hits dealerships this fall with a starting price of $55,750 plus a destination fee.
Power comes from a 240-horsepower, turbocharged 3.0-liter V-6 diesel engine that makes 406 pounds-feet of torque at 1,750 rpm. The engine works with an eight-speed automatic transmission and standard all-wheel drive. Porsche cites a zero-to-60-mph time of 7.2 seconds, a top speed of 135 mph and a driving range of 740 miles, which is longer than most passengers will be willing to tolerate in one sitting. Towing capacity is a healthy 7,700 pounds.