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Originally Posted by ju-on
I've also heard that at hwy speeds, you are better off using AC rather then having your windows down. Apparently having the windows down at that speed causes a ton of drag and actually makes you get worse milage then just having them up and the AC on. Anyone else heard this?
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That would probably depend on the aerodynamics of the car you are driving. If when you open the windows it becomes a giant wind-sock, then you probably are better off using the air. Otherwise, the A/C compressor obviously takes power/energy to rotate and compress the refrigerant. Doesn't really matter to me, as long as I have A/C that works, I am going to use it!!
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