BMW 3 Series LWB mileage varies, depending on the variant. The petrol-manual variant of 3 Series LWB has a mileage of 0 kmpl. The petrol-automatic variant of 3 Series LWB has a mileage of 15.39 kmpl. The diesel-manual variant of BMW 3 Series LWB has a mileage of 0 kmpl. The diesel-automatic variant of BMW 3 Series LWB has a mileage of 0kmpl. Note that the mileage figures are as per ARAI.