I have been wondering for a while if there are efficiency differences between using Normal or Max A/C (a/c using outside air vs a/c using recirulated air). Now, I'm not asking about which should be used under certain conditions but rather which causes the most fuel consumption. Hope you guys understand what I'm getting at here. Here is my theory. When selecting normal a/c the recirculation door opens to let outside air into the cabin. This would seem to increase the drag on the car, making it consume more fuel. Now when Max a/c is selected, the recirculation door closes blocking ouside air from coming into the cabin, thus reducing the drag. In this case it would seem that Max a/c would be more fuel efficient than normal a/c. Does this sound right to anyone? Yes, I do realize that no a/c is more fuel efficient but I am talking about when the a/c is in use. So in technical terms, is my assumption correct?