BMW has revealed further details about its upcoming six-cylinder 545e plug-in hybrid.

Joining the four-cylinder 530e, which has been on sale since 2017 and was BMW’s most popular electrified model last year, the 545e is the first hybrid six-cylinder powertrain to feature in a 5 Series.

While announced at the unveiling of the facelifted 5 Series back in May, no details were unveiled about the new plug-in hybrid model.

However, BMW has now announced full details about the 545e, which will feature a 3.0-litre straight-six petrol engine mated to a 12kWh battery and electric motor. Power is delivered to all four wheels via BMW’s xDrive all-wheel-drive system.

That combination produces 389bhp and 600Nm of torque, which enables a 0-60mph (0-97km/h) time of just 4.5 seconds and a top speed of 155mph (249km/h), or 87mph (140km/h) on electricity. That makes it the quickest BMW plug-in hybrid currently available.

With a 34-mile (55-kilometre) electric range, it also means the 545e can return up to 166mpg, along with CO2 emissions ranging between 38g/km and 54g/km.

The latest BMW 5 Series benefits from refreshed styling, including a slimmer and wider front grille, along with a larger 12.3-inch media system and new connectivity and driver assistance technologies.

Elsewhere in the plug-in hybrid range, the smaller 530e will also be available as a Touring (estate) for the first time, as pre-facelift it was only offered as a saloon. The 545e will just be available as a four-door.

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