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The ratio's of the gears in the SMG car are not particularly close. The STi and Celca are good examples of close ratio gear boxes.
The performance advantage of SMG comes from the reduction in time spent at zero (or negative) acceleration. Thats the time at which the car stops acelerating in the lower gear because the system has started to clutch in to the time its accelerating again in the next gear with the clutch fully engaged.
Every shift the SMG car spends less time coasting than the manual car will. Thats its advantage in a straight line.
The fact it allows the driver to focus more on driving is a separate and important issue.
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Manual gearboxes, the rotary dial of cars.
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