Nissan engineers have created a new prototype of the all-electric LEAF - with a whopping 75 percent increase in driving range. Removing the rear seats, they were able to shoehorn a 48 kWh battery in the back, double the size of the production car’s standard unit. The prototype was built to compete in a new ECOseries motorsport event, which rewards efficiency and fuel economy rather than outright speed.. and it seems the extra hours put in by the team duly paid off as they took first place.