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What is the over drive button in cars for?

The "overdrive" button in a car disables the highest gear in the automatic transmission. Overdrive gears are typically designed for fuel efficiency at higher speeds. When the overdrive is OFF, the transmission will stay in a lower gear, resulting in:

* Increased engine speed: The engine will rev higher at the same vehicle speed.

* More power and quicker acceleration: This is helpful for passing or driving uphill.

* Reduced fuel economy: The engine is working harder and using more fuel.

Essentially, the overdrive button allows the driver to choose between prioritizing fuel efficiency (overdrive ON) and power/acceleration (overdrive OFF). Many newer cars don't have a dedicated overdrive button, instead integrating this functionality into other drive modes (e.g., "Sport" mode).

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