BMW X3 20 xDrive: Fuel consumption, combined in the WLTP cycle: 7.6 – 6.9 l/100 km (37.2 – 40.9 mpg imp). CO2 emissions, combined in the WLTP cycle: 172 – 156 g/km. CO2 class(es): F. BMW X3 M50 xDrive: Fuel consumption, combined in the WLTP cycle: 8.3 – 7.7 l/100 km (34.0 – 36.7 mpg imp). CO2 emissions, combined in the WLTP cycle: 189 – 175 g/km. CO2 class(es): G – F.