Being a luxury sports coupe, comfort and speed are more important than ecology. However, with only one engine option, every model of the 8 Series has almost the same fuel economy, which is 9.6 L/100 km on the highway and 13.9 L/100 km in the city for Gran Coupe, Convertible, and Alpina B8 models, while the Coupe gets slightly better mileage at 9.3 L/100 km highway and 13.5 L/100 km city.