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A quick simple way to determine if it is side mirror air turbulence is to fold mirrors in while driving. If sound changes noticeably then there's issue. Alignment of glass is also easy 20 min fix if not correct. Another thing to look at are door seals. Sometimes they come out of retaining channel and don't seal correctly as they should. Just push back into slot. Today's cars are very aerodynamic and it is usually something simple. Serious problems are obvious to even a casual mechanical eye. I'm not a lexus tech. I own Autoglass business and have been diagnosing and fixing air noise issues for decades that the factory techs just can't seem to find that are right in their face. My wife's 2010 rx350 is acceptably quiet at 70 mph.