Porsche recently invited Wired to test drive one of its three 918 development mules at the Nardo Test Track as it appears the plug-in hybrid supercar is getting ever closer to production. The prototype uses a 4.6-liter V8 engine sourced from an ALMS LMP2 RS Spyder, which produces 570hp, and is backed up by a pair of electric motors: a 121hp unit in the seven-speed transmission and a 107hp motor powering the front axle. Combined maximum output stands at 770hp and 553lb-ft of torque.