 The Nissan Serena C26 S-HYBRID has its regeneration capacity and output power of the Eco Motor, which is an alternator that is used for Nissan's Serena having an idling stop mechanism and capable of restarting an engine, upgraded.Nissan added a lead sub-battery in the engine room for extended energy regeneration capacity.The Serena has a fuel economy of 15.2 km/L (approx 35.8 mpg) under the JC08 test mode.