BMW has revealed details of the fastest and most frugal 6-Series ever - and we’ve got the pictures.

The BMW 635d Coupe uses the German manufacturer’s acclaimed 3-litre twin-turbocharged diesel engine producing 286bhp and 428lb/ft of pulling power.

This means acceleration from 0-62mph (100kph) in 6.3 seconds and an electronically limited top speed of 155mph, while boasting a combined fuel economy of 40.9mpg.

BMW claim the diesel’s advanced six-speed automatic gearbox shifts up and down smoother and up to 50 per cent quicker than the previous ‘box.

A convertible diesel is also offered, which hits 62mph in 6.6 seconds and manages 39.2mpg.

Prices for the new diesel 6-Series start at £53,910 for the Coupe and rise to £61,800 for the Sport Convertible.

BMW has made some subtle design changes, with the grille made larger to allow greater air intake and is available with a new choice of alloy wheel in 17, 18 and 19-inch sizes.

Inside, the German company has introduced an infotainment system, which includes eight ‘Favourite’ shortcut buttons.

Prices for the 6-Series start at £49,300 for the entry level 630i coupe, rising to £63,215 for the 367bhp 650i Sport convertible.

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