A »A variable displacement engine, or cylinder deactivation, enhances fuel efficiency by shutting down some cylinders when full power isn't needed. This is done by deactivating the valves and fuel injectors for those cylinders, reducing engine load and fuel consumption. When more power is required, the system seamlessly reactivates the cylinders, ensuring a balance between performance and efficiency without noticeable changes to the driver.

A »A variable displacement engine deactivates cylinders under light loads to improve fuel efficiency. It achieves this by shutting off fuel injection and valve operation in selected cylinders, effectively turning them off. The remaining active cylinders operate at a higher load, maintaining performance while reducing overall fuel consumption.