I'm new to the forum but have searched for this subject without success. First, don't get me wrong, it's way quiet relative to anything else I have ever owned. My take is, and I'm sure I'm not the first, that it comes primarily from the uninsulated spare tire cover. I'm thinking some kind of foam or Dynamat could be used to lower the noise significantly. Just so I'm not reinventing the wheel...Has anyone else done this and have any advice for me? Thanks.