STUTTGART // The Porsche supervisory board has given the green light for the series development of the Porsche 918 Spyder. The 918 debuted as a concept at this year's Geneva Motor Show. The concept study allows CO2 emissions of 70 g/km, corresponding to a fuel consumption of 3.0 litre/100 km (94.1 mpg imp) in the NEDC, on the one hand, and the performance of a super-sports car, on the other. It used a 500-horsepower V8 along with a pair of electric motors with 109 hp each and a lithium ion battery that can provide 16 miles of emissions-free driving from grid energy. Michael Macht, president and chairman of the board of management of Porsche AG said: "Production of the 918 Spyder in a limited series proves that we are taking the right approach with Porsche Intelligent Performance featuring the combination of supreme performance and efficient drivetrain concepts." Porsche has not announced when the 918 will be available.