The general trend these days is for manufacturers to use as small an engine as they can get away with. There are many reasons for this, with the primary one being maximizing fuel efficiency. The more compact an engine is, the less energy it needs to work at its peak potential, and thus the less fuel it drinks. Twinning a smaller powerplant with a turbocharger affords it the grunt it needs to work effectively across a range of driving scenarios, while remaining more efficient than older and larger units. In addition, their smaller sizes ensure that they take up less space, allowing automakers to optimize internal room.
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