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same for meMix of both. If it's really warm when i get in i tend to slap the aircon on about 18 with the windows closed....once it cools and i'm driving i sometimes turn it off and open the window, depends just how warm it is.
I think when cruising, like you do on a motorway, the effect air con will have on your fuel economy will be fairly insignificant to be honest. As you say, drag caused by an open window will be worse.