Bus At the Delhi Auto Expo 2016, Ashok Leyland introduced an advanced non-plugin version of HYBUS. It is claimed to be India's first non-plugin series hybrid bus. The bus uses ultra-capacitors to store energy, a feature that improves power density and fuel efficiency, because energy is stored electrostatically and does not involve chemical reactions. The ultra-capacitors are claimed to be 4–5 times more durable than conventional lithium-ion batteries. HYBUS is powered by an H-Series 6-cylinder diesel (BS IV compliant) engine that is not used to drive the vehicle ahead, but to charge the ultra-capacitors that powers the 150 kW electric motor. Automatic start-stop is used to decrease the overall engine idling time. The bus can restart using the stored energy when the engine is off. The fuel-efficiency of the engine thus increases and NVH (Noise-vibration-harshness) levels decrease. The buses and trucks are set to feature a new electronic shift-by-wire transmission technology as well as electronic-controlled engine management for greater fuel efficiency. Ashok Leyland focuses on improving fuel efficiency without affecting automotive power, and the vehicles will have a 5% improvement on fuel efficiency. Ashok Leyland is also developing electric batteries and bio-fuel modes. Electric Technology In 2016 the company launched the country's first indigenously produced fully electric bus, called Circuit. The bus is a zero-emission vehicle that can run 120 km on a single charge, and has an alert system that can signal if the bus is low on power. The bus will be introduced under the National Electric Mobility Plan with an aim of 20% penetration of electric or hybrid vehicles by 2020. Euro VI Truck AT the Delhi Auto Expo 2016, the company showcased its first indigenously produced Euro VI truck 4940. The truck is powered by the company's flagship range of engine, Neptune, which is an 8l engine that produces 400 hp and 1600Nm of torque. The truck is designed to meet Euro VI norms. iEGR In 2017, the company showcased iEGR (intelligent exhaust gas recirculation) technology for its trucks and buses to meet BS-IV emission standards. The technology also promises other advantages like better fuel efficiency than BS-III trucks, and power transmission up to 400 HP. iBUS Ashok Leyland announced iBUS in the beginning of 2008, as part of the future for the country's increasingly traffic-clogged major cities. Its Rs 60-lakh iBus is a feature-filled, low-floor concept bus for the metros revealed during the Auto Expo