Let's take a V-8 engine for example. A V-8 engine has eight cylinders. Whenever the engine is running, the eight cylinders work, burning fuel and air. Most cars, trucks and SUVs with V-8 engines have them because usually the more cylinders an engine has, the more powerful it is. That's why V-8 engines are often used in sports cars or heavy trucks. But while people like V-8 engines, because they're fast and can tow heavy loads, most people don't get things done all the time. This is where cylinder deactivation comes into play. The cylinder deactivation number of the engine cylinders is closed when it is not needed. This means that when a car or truck needs to maintain a constant speed and not speed, some cylinders are not in use. Since they are not used, they do not receive gas or - and save fuel. Cylinder deactivation technology has been used in V8-powered cars and trucks in recent years, but some automakers are starting to add it to their six-cylinder engines as well. Cylinder deactivation technology is estimated to improve engine efficiency 7.5