Built as a collaboration between Nissan's luxury brand and Lotus, the Emerg-E uses the same electric-with-gas backup power system as a Chevrolet Volt, but laid out in a sports car. The rear wheels turn thanks to two 201-hp electric motors, which can travel 30 miles on electrons only before a petit 1.2-liter, 3-cylinder gasoline engine turns on to recharge the lithium-ion battery pack. The Emerg-E uses aluminum and carbon fiber to stay light, and even so still weighs 3,500 lbs. But that 402-hp system pushes the Emerg-E to 60 mph in 4 seconds, while granting a 300-mile range in total. Based on Infinit's estimates, the Emerg-E would get roughly 99 mpg.