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If you mean does the A/C cause the engine to use more fuel, the answer is yes and no. In city driving the A/C does indeed cause the engine to use more fuel. On the highway at speed, the engine uses about the same amount of fuel with the A/C on as with the A/C off and windows down. It also depends on the model year of the car. Older cars have A/C compressors that require more power to drive.

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20y ago

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