The 330Li uses a 258hp, 400Nm, 2.0-litre turbo-petrol engine, while the 320Ld that we're driving today uses a 190hp, 400Nm, 2.0-litre turbo-diesel. In case you're wondering, the BMW 3 Series Gran Limousine fuel efficiency on the ARAI cycle is 15.39kpl for the petrol and 19.61kpl for the diesel.