Quote:
Originally Posted by nospam
I think modern BMWs use an electric and not belt driven A/C compressor so it should not affect power delivery or gas mileage. This is why you still have A/C when ASS has engaged.
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The energy to drive the compressor has to come from somewhere. The only energy sources are the engine and the battery. The battery only stores energy from the engine (via the alternator). So yes, it will affect the gas mileage.