I bought the car brand new and the first time I drove it on the highway, I noticed a persistent and very annoying fluttering noise at 65+mph. It sounds like it's coming from the front passenger door, but I cannot be sure. It sounds like a piece of paper or plastic inside the door to make this fluttering noise. Even with the stereo on at reasonable volume, I can hear it. It's pretty loud and very annoying! I'm going to let it play out for a few thousand miles to see if it resolves itself. If not, I'll take it into the dealership. I honestly don't want them disassembling the door panel to fix this issue though if not absolutely necessary. I've had new problems created by mechanics disassembling interiors on past cars. Cracked plastics, loose fasters, etc.