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It allows the car to operate at lower revs making for a smoother drive and better fuel consumption at higher speeds. The gearbox will shift into overdrive itself, so it is always best to have it switched on in normal driving conditions.

You only need to switch off the overdrive when you need greater engine braking or are towing a heavy load.

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11y ago
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Q: What does the overdrive switch do in a Toyota Corolla s?
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