Nissan is showcasing a revised version of the Leaf at the upcoming Detroit Auto Show. The new US-market version is being produced in the Tennessee for the North American market and encompasses a series of updates. The electric vehicle now benefits from improved aerodynamics, cutting its drag coefficient from 0.29 to 0.28, gets a new regenerative braking system and an available onboard quick-charger to cut its charging time in half from a 220-volt wall socket.