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When the car reaches the speed that you would like to attain (say 55 MPH) and levels off (stays at 55 MPH) the engine does not require as much gas as when you are getting up to speed (0 - 54 MPH). So considering this, Overdrive is when you get up to speed and the amount of gas put into the chambers is reduced, (but you still continue at 55 MPH) saving tons of gas and is easier on your engine. The overdrive on/off switch controls the transmission. If overdrive is off (indicated by light on dash) vehicle will not shift into overdriven gear (4th gear); which can be useful for mountain driving. Overdrive should be on though as it will greatly effect your gas milage if it is off.

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โˆ™ 2007-10-11 05:15:53
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Q: What does the overdrive switch do?
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