More information directly from Audi: https://www.audi-mediacenter.com/en/techday-on-combustion-engine-technology-8738/versatile-and-efficient-mild-hybrid-techno

More information directly from Audi: https://www.audi-mediacenter.com/en/techday-on-combustion-engine-technology-8738/versatile-and-efficient-mild-hybrid-technology-8761 https://www.audi-mediacenter.com/en/techday-on-combustion-en... "The 48-volt-based MHEV technology is particularly more comfortable and efficient. If the driver takes his foot off the accelerator at a speed between 55 and 160 km/h (34.2 to 99.4 mph), the car can coast for up to 40 seconds with the engine off completely. During slow coasting, the start-stop phase already begins at 22 km/h (13.7 mph). Once the driver accelerates again – whether from a stop or while driving – the vehicle restarts quickly and very comfortably: the BAS revs up the internal combustion engine to the target speed, then injection occurs again and, in the case of a gasoline engine, ignition. While the conventional pinion starter remains on board, it practically comes into play only at the initial starting, if the engine oil is still cold and viscous. In such a situation, the belt of the BAS could slip through. "