With 156 turns over its 12.42 miles (19.99 km) course and elevation changes ranging from 4,720 ft (1,440 m) to 14,110 ft (4,300 m), Pikes Peak International Hill Climb is one of the most grueling races in the world for both humans and machines. It's particularly challenging for gas-powered vehicles, since the air contains less oxygen at higher altitudes. As a result,
