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Why does auto transmission waste more gas?

Updated: 8/17/2019
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14y ago

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Because there is an inherent amount of slippage in an A/T due to the torque converter, and this wastes fuel. In modern A/T this is very little and the mileage difference between an auto and a manual will be around 1-2 mpg.

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Q: Why does auto transmission waste more gas?
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