BMW has announced details of its most fuel-efficient car ever – the 116d, and has also released special editions of the 5-Series aimed at business customers.

Powered by a detuned version of the 2.0-litre diesel engine found in the 118d and 120d, the 116d offers 116bhp, claimed combined fuel economy of 64.2mpg and CO2 emissions of 118g/km – ensuring it sits in the lowest benefit-in-kind tax band for diesels.

Due to go on sale in March, prices start at £17,605.

For the 5-Series, the Business Edition model is available on saloon and Touring versions of the 520d, 525d and 530d diesels.

The new trim adds leather seats, Bluetooth telephony, satellite navigation, six-CD and BMW ConnectedDrive Assist and Online.

It costs £1,000 extra over the SE or M Sport trim level for the 520d, and £1,750 for the other engines thanks to added equipment including upgraded navigation, voice control and 19-inch alloys.

Prices start at £28,430.

Also in the 1-Series range, a new Sport trim level has been introduced for 116i, 116d and 118d models.

Based on the ES trim, Sport adds 17-inch alloy wheels, foglights, heated wing mirrors and washer jets, a multi-function leather steering wheel and sport seats. Prices start at £17,220.