Optimum Shift Indicator.
Optimum, perfectly-timed gear changes can help save fuel, particularly in urban traffic and over long distances.
Change gears at the right time, use less fuel – the engine’s electronics system identifies the most efficient gear, based on road conditions and engine speed. An arrow lights up in the Info Display to show when it would be more efficient to shift into a higher or lower gear. The system also recognises quick acceleration and will delay its recommendation accordingly until the engine speed is up. BMW internal comparative tests have shown that vehicles with the Optimum Shift Indicator use around four per cent less fuel.