Why does the Focus use a three-cylinder engine?

[VonMaggie]

The Focus uses a three-cylinder engine to reduce exhaust emissions. The Focus is a compact sedan under the Ford brand, equipped with two engines: a 1.5L naturally aspirated engine with a maximum power of 90kW and a maximum torque of 153Nm, and a 1.5T turbocharged engine with a maximum power of 128kW and a maximum torque of 243Nm. The dimensions of the Focus are 4647mm in length, 1810mm in width, and 1468mm in height, with a wheelbase of 2705mm. The car features front-wheel drive, a front MacPherson strut independent suspension, and a rear torsion beam non-independent suspension.