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its basically the same thing. an automatic tranny wont go in Overdrive until youre going at a generally constant speed. the same is true with a manual transmission- while driving on average roads (40-55 mph) you will not shift into the final gear until you are going at a constant speed.

Overdrive is a gear that turns the vehicle driveshaft faster than the engine and is used to improve fuel mileage (and also lower CO2 emissions). Typically 5 or greater in a manual or 4th gear or greater in an automatic is overdrive but there are exceptions. Because of CAFE (fuel economy standards) virtually all cars and small trucks have come factory with ovedrive since 1981.

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