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Overdrive is used in all vehicles to save fuel. A gear is 'overdriven' when the output turns at a faster rate than the input, usually in RPM. It is usually expressed as a ratio indicating the number of turns per crankshaft revolution at the output shaft of the transmission. In towing, the use of OD is not recommended in automatic transmissions by most manufacturers as it may 'bog' the engine and result in sporadic up and down shifting that is bad for the drivetrain and decreased gas mileage.
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