This is one of the most important driving techniques that you have likely not learned in driving school. Ciro Santilli had only learnt it from YouTube.
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Engine braking is a technique used to slow down a vehicle by utilizing the engine's resistance rather than relying solely on the vehicle's brake system. When a driver takes their foot off the accelerator pedal, the throttle valve in the engine closes, which reduces the amount of air and fuel entering the engine. This creates a vacuum, which generates resistance against the turning motion of the engine, ultimately slowing down the vehicle.