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The gear shift indicator in the BMW 3 Series Sedan.

All BMW 3 Series Sedan vehicles fitted with a manual transmission come with a gear shift indicator which constantly calculates which gear is currently the most economical and accordingly advises the driver when to shift. When calculating, the system takes both the driving situation and engine load into account. For example, if the vehicle is accelerating hard, it will wait until a higher rev count before recommending a gear change. Changing gear at the right moment can considerably reduce fuel consumption - especially in urban driving, but also on long journeys.