New BMW 3-series review, test drive

BMW’s ‘Eco Pro’ setting puts the car into its most fuel-efficient mode at the touch of a button. The system modifies the powertrain management and the programming for the heating and air-conditioning systems to help deliver the highest level of efficiency. It also customises the engine response by altering engine maps, so that you get only as much power as you need when you step on the accelerator. Even the gearbox’s shift pattern is altered so that engine speed is kept low. BMW claims Eco Pro lowers the average fuel consumption by up to 20 percent.