The Porsche 918 Spyder is a mid-engined plug-in hybrid sports car by Porsche. The Spyder is powered by a naturally-aspirated 4.6 litre V8 engine, developing 608 horsepower (453 kW), with two electric motors delivering an additional 279 horsepower (208 kW) for a combined output of 887 horsepower (661 kW). The 918 Spyder's 6.8 kWh lithium-ion battery pack delivers an all-electric range of 19 km (12 mi) under EPA's five-cycle tests. The car has a top speed of around 340 km/h (210 mph). The 918 Spyder is a limited edition Hypercar, with 918 units manufactured and sold as a 2014 model year. Production began on September 18, 2013, with deliveries initially scheduled to begin in December 2013. The starting price was US$847,000. The 918 Spyder was sold out in December 2014. The country with the most orders was the United States with 297 units. Production ended in June 2015. The 918 Spyder was first shown as a concept at the 80th Geneva Motor Show in March 2010. The production version was unveiled at the September 2013 Frankfurt Motor Show. Porsche also unveiled the RSR racing variant of the 918 at the 2011 North American International Auto Show, which combines hybrid technology first used in the 997 GT3 R Hybrid, with styling from the 918 Spyder. The 918 Spyder was the second plug-in hybrid car from Porsche, after the 2014 Panamera S E-Hybrid.