Besides the hybrid gasoline-electric powertrain, other innovations include rear-wheel steering, where the rear wheels adjust slightly in turns. It can go up to 19 miles on battery power alone. By itself, the V-8 gasoline engine produces 608 hp. Like many race cars, the Porsche 918 Spyder is largely built of lightweight but strong carbon fiber-reinforced polymer. The lightweight, even more racing-oriented Weissach Package of options boosts the sticker price to $929,000.