I almost always hear a very mild/but obvious flutter noise for approx a second or so around 58 mph. The problem with such a quiet vehicles is that something like this really stands out. It sounds like a cell phone that is sitting on a table and is vibrating. It certainly sounds like it is being generated in the front end. I've installed mud flaps and body side molding but aside from that, everything is stock on my new rtl. Anyone have any thoughts. I have read about the high-pitch higher speed problems but nothing like I am describing.