Fuel consumption is thereby reduced, while the full power output of the engine is made available for acceleration phases. (porsche.com)
The electricity is stored temporarily in the battery; it is used during the next acceleration phase to reduce the load on the generator and thus on the engine. (ausmotive.com)
The need for all - wheel drive is generally higher at low and moderate speeds with acceleration phases than when driving fast at a constant speed. (greencarcongress.com)