Ultimate fuel economy: An all-electric SUV from Phoenix Motorcars has a 138 mile range, a top speed of 95 mph and it recharges in as little as ten minutes. The secret: Nano-materials that keep next-gen lithium-ion batteries from overheating -- and give them a long life. For more videos from Popular Mechanics visit: www.popularmechanics.com Everything from the World of Popular Mechanics: www.popularmechanics.com Subscribe to Popular Mechanics: subscribe.hearstmags.com -
