It's the cleanest 5 Series ever - and BMW claims it outperforms its closest rivals by 10 per cent when it comes to mpg. Created with the UK business market in mind, the 520d EfficientDynamics Saloon returns fuel economy of 62.8mpg and CO2 emissions of 119g/km, which means a company car benefit-in-kind taxation band of only 13 per cent.
Despite the efficiency improvements, there's no change to the 184hp or 380Nm of torque developed by the 2.0-litre turbodiesel engine. This means the car accelerates from zero to 62mph in just 8.2 seconds.
In addition to the standard Auto Start-Stop, Optimum Gearshift Indicator, Brake Energy Regeneration and Active Aerodynamics, the BMW 520d EfficientDynamics Saloon has a longer final drive ratio to reduce engine revs at highway speeds, and low rolling resistance tyres on Streamline-design alloy wheels.
There's also a new ECO-PRO Mode which promotes economical and comfortable driving at low speeds by adjusting the engine mapping, throttle sensitivity, automatic gearshift points and the amount of power consumed by electrical ancillaries including climate control and heated seats.
The new model goes on sale in September priced from £30,435.