YAN Engines is developing Differential stroke-Cycle piston technology (D-Cycle) to enhance engine power-density and fuel efficiency. Their innovative D-Cycle replaces traditional pistons in internal combustion engines, completing four engine strokes in a single crankshaft revolution. The company has successfully completed pilot programs with major vehicle manufacturers, achieving over 20% fuel savings. YAN Engines focuses on retrofitting and designing D-Cycle pistons for various engines, leading to a 20% increase in fuel economy without compromising performance. Their technology is applicable to gasoline and diesel engines, aiming to create a cleaner and more energy-efficient world.