eli5, what does the OD button do on a car and why is it there?

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I’m assuming it’s the overdrive button on the side of my gearshift. 2012 Nissan Altima, base model. Everything I googled assumes I know more than how to change oil. Thanks in advance!!! 😊

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Anonymous 0 Comments

Overdrive is the highest gear and it gives better fuel efficiency for highway driving. You have a button to turn it off in case you’re towing and need more torque or are driving in the mountains and want more engine speed for climbing or more engine braking for descending.

In 99% of cases you’re probably OK to just leave overdrive enabled and enjoy some better fuel economy.

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