The Eindhoven University of Technology in the Netherlands developed a new type of automotive flywheel engine that can save 30% fuel. The engine 's flywheel weighs 10 kilograms, absorbing and storing the kinetic energy generated when the car is braking. When the car restarts, the stored energy of the flywheel can be used. Once the energy stored in the flywheel is exhausted, the gasoline engine will automatically take over. GTB2060VKLR TURBO,OM642-LS engine,Mercedes Benz ML 350 ,642850 Engine Fengcheng Fire Turbocharger Manufacturing Co; Ltd. , https://www.fireturbocharger.com