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it may not be an improvement over just cracking the windows, the wind drag would be generated from air allowed into car. so full window down screen may be the same amount of air in and drag as if the window is down slightly. This is just my theory and could be way off in real life.
Or you could do what i do and crack the window for a few seconds everytime it gets too unbearable, and open the window (they are the crank kind and dont want to reach for passenger side) all the way when you need to slow down.
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