What is the "overdrive" for?
overdrive is just what it sounds like-the transmission turns slower than the engine, allowing more speed with less fuel. It is only applicable in higher speed, low load situations like open road driving, but most modern cars with overdrive will allow engagement at speeds as low as 35 MPH to save fuel. To a point, overdrive is effective for some city driving, but if you constantly do stop and go driving, in city enviornments at speeds under 40, it is best for the engine (and performance) to 'lock out' overdrive.
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