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The A/C is driven by a compressor, which is turned by a belt attached to the engine.
It cuts in via a clutch, controlled by the climate controls in the car.
Whilst it is operational (clutched in) it puts an extra load on the engine. (the belt becomes harder to turn).
Any load on an engine, will require more fuel to run it.
It can reduce gas mileage by up to 5 MPG.
So for a compact car giving 35 MPG, it will reduce to 30 MPG
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