Porsche announced it will build a hybrid version of its Cayenne SUV.  Porsche said the hybrid Cayenne, to be launched at the end of the decade, will cut fuel consumption by about 15 percent while retaining its driving dynamics. The full-hybrid system, which will use a petrol engine and an electric motor that will operate independently or jointly, is being developed with the Volkswagen Group.  It is expected it will share much of its powertrain with Audi's Q7 hybrid concept.