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Short Answer: Because it takes power from the engine to operate the A/C compressor. More detailed answer: Under a given load, an engine will operate at a given speed when a certain amount of fuel is provided. If you don't increase the fuel, but you increase the load (by turning on the A/C compressor), something has to give, and the engine operates a bit more slowly. Therefore, you would have to press on the gas just a tiny bit more to get the engine to operate at the same speed, which necessarily means you're using a bit more fuel.
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What country song goes everytime i turn around the feeling comes out i love you?
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