Short shifting is a driving technique in which the gear is changed up before necessary. By short shifting, not all of the engine's power from the previous gear is being used, therefore power and torque are lost.
The most common reason to change gear early during fast driving is to not lose valuable time changing gear later. Although this means not being able to accelerate using all of the engine's power, there is a time saving from changing gear later on. This can aid overtaking by ensuring that the car is in the right gear in anticipation of the maneuver. Another reason is to improve fuel economy by driving at lower rpm if acceleration is not what is being sought. Another reason is to intentionally reduce power and torque, to get more grip. For example, if there is a wet road, there is an increased chance of sliding or wheel spin. If the gear is changed up, these difficulties are reduced. Short shifting is a technique that can help to maintain vehicle stability through bends by avoiding an unsettling shift in balance mid-corner.
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—Mark Twain [Samuel Langhorne Clemens] (1835–1910)
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