In todays highly aerodynamic Cars, shutting of the Air conditioning and opening the windows will actually use more Gas than keeping the windows shut and running the Air.

In older cars, that were less aerodynamic, and had Air conditioners that used a lot more power the opposite was the case, but with todays cars when you open the windows at speed you create massive drag on otherwise highly aerodynamic vehicles and actually use more gas.

It pays to know these things.

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Charles_Main

"Whenever a man has cast a longing eye on offices, a rottenness begins in his conduct."
Thomas Jefferson

"Dependence begets subservience and venality, suffocates the germ of virtue, and prepares fit tools for the designs of ambition."
Thomas Jefferson