Porsche is adding a new Cayenne E-Hybrid to the line-up.  The turbo 3.0-liter V6 combines with an electric motor to generate total system output of 455 horsepower and 516 lb-ft of torque. EV range = 27-miles.  Porsche says it will go 0-60 in 4.7 seconds.  The price starts at $79,900 when it goes on sale in early 2019.