Answers: Yes, having the a/c on will burn more fuel than next to it off. The a/c uses a compressor to compress the refrigerant used for the a/c system. This compressor runs bad of the crank shaft so it takes away some of the power used to move the vehicle. When you are driving the vehicle keep the accelorator pedal steady and turn on your a/c. You should touch a slight jump that results from the a/c compressor adjectives. You'll also notice your velocity subside slightly. If you want to maintain your previous velocity, you'll own to give the engine more fuel. This is be your decreased fuel mileage comes from. However, the cost difference you will experience by using the vehicle minus a/c compared to with a/c will not be that significant. I influence, stay cool. If you are really curious. Drive a week with a/c and the subsequent without a/c and compare your fuel mileage difference.
Michael M say that the pullies are all operation whether the a/c is on or not. This is correct. But if the a/c is not unavailable, the compressor is not drawing any power from belt. So it acts almost close to an idler puller.
Another user said that the engine is hotter and specifically why more fuel is used. This is not correct. The increased fuel consumption is from the extra power need to run the compressor. The engine will attain hotter, but that is because the engine's power output increases, which routine more waste steam is generated.
Not satisfactory to worry roughly. Driving with the window down consumes extra fuel because of the aerodynamic drag the open window creates. Just use your a/c and be comfortable.
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