The downsizing of automobiles is the way to reduce engine displacement

Generally when engine displacement and its size and weight are reduced, engine power is reduced as well. When engine displacement is decreased by 2/3, fuel efficiency is increased by 15%; when engine displacement is reduced by half, fuel efficiency is increased by 25%. However, when displacement is reduced, power is also reduced. It was an obstacle for the automobile industry to make a high fuel efficiency and low carbon emission vehicle.

The key to recent downsizing is to increase output and reduce displacement

The recent core downsizing technology is the use of smaller displacement engines which produce more power. Of course this is only possible with supporting technology. The most important technology, and the first step of engine downsizing, is applying a turbocharger. In other words, without a turbocharger, it is impossible to downsize and maintain power output. Engine downsizing refers to an engine with a turbocharger installed.