The new BMW 3-Series Sedan is equipped as standard with an Auto Start-Stop function, which automatically switches off the engine during short stops at traffic lights or in stationary traffic, so as not to waste fuel. For the first time, and uniquely in this class, this system can be combined with the new eight-speed automatic transmission. The new BMW 3-Series also comes with standard-fitted Brake Energy Regeneration. As far as possible, therefore, power for the vehicle electrical system is generated only during braking and overrun. When the engine is under load, the alternator can often be disengaged. This not only means that electricity can be generated with little or no effect on fuel consumption, it also grants the sports sedan livelier acceleration. Finally, the new Driving Experience Control switch gives drivers the option of selecting ECO PRO mode which, by modifying the powertrain management and programming the heating and air conditioning, the heated seats and the exterior mirrors to operate at optimum efficiency, reduces fuel consumption by as much as 20 per cent.