You might try running a piece of masking tape, or any tape, along the windshield edge and/or the edge of the driver's side window frame, to possibly locate the air leak. I would suspect an air leak long before wind turbulence from the side mirror.
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2009 Country Coach Veranda 400, ISM 500, Aqua Hot 525D
2019 Lincoln Nautilus 2.7L Toad
2020 Lectric XP E-bike (Hybrid)
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