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BMW EfficientDynamics in the BMW M4 Convertible.

As in other areas, the BMW M4 Convertible is a top performer when it comes to efficiency. Intelligent lightweight construction and BMW EfficientDynamics measures such as Auto Start-Stop or Brake Energy Regeneration ensure optimal use of resources and thus play a crucial role in maintaining the power and stamina of the BMW M4 Convertible. This results in not only better dynamics, but also a reduction in fuel consumption and emissions.


Comprehensive coordinated aerodynamic elements optimise driving dynamics, stability and control in M vehicles, especially at high speeds.
The striking front apron visually embodies the specific aerodynamics concept of the M car. On the racetrack, large air inlets cool off the engine, charge air, oil, brakes and the transmission oil in the M dual-clutch transmission. The two vertical inlets in the Aero Curtain and the side M gills with integrated Air Breather behind the wheel arches create an accelerated flow of air around the front wheels. This buffer of air encloses the wheel arches aerodynamically, minimising turbulence and reducing air resistance.
As a whole, the precise coordination of these elements works to create aerodynamic balance, giving the cars that unmistakeable M-feel.

Brake Energy Regeneration.

Every time the brakes are hit, kinetic energy is generated and until recently this energy went unused. Brake Energy Regeneration takes advantage of this long-overlooked potential. It harnesses the energy that is generated whenever the driver brakes or takes their foot off the accelerator and turns it into electricity. This electricity is then used to charge the car battery. The intelligent energy management system means that the alternator no longer needs to run constantly, which reduces the strain on the generator. The result: reduced fuel consumption and increased performance – classic BMW EfficientDynamics.

Gear 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 Gear Shift Indicator use around four per cent less fuel.

Auto Start-Stop.

Auto Start-Stop switches the engine off when the vehicle comes to a temporary standstill (e.g. at traffic lights or in a traffic jam) to further reduce overall fuel consumption. When the driver presses down on the clutch (manual transmission) or takes their foot off the brake (M DCT Drivelogic), the engine automatically starts up again in a fraction of a second.
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