Quote:
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Originally Posted by Greg McCoy
In some smaller older cars with 4-cylinders and low horsepower, you can notice the difference in acceleration when the A/C is on or off 
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It doesn't matter the age of the car or the size of the engine, the AC will slow your acceleration. Some cars just have enough excess power that it isn't very noticeable. (The AC load robs the car of a smaller percentage of power to the wheels)
Wetzel