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OK, so this indicates that A/C takes a slice of efficiency. This is also my hands-on experience, even though it's far from extensive.




Anything powered in your car is going to take a slice of the engine power, be driven directly off the engine, or placing an electrical load via the alternator. This even applies to things like the radio.

A/C just happens to be something that uses a significant amount of power, whereas others tend to be too trivial to notice.
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