Hey Hopeful! The MKC, since it's original release, has been lauded as being very quiet in most every way. Recently my wife and I returned from a 7,700 mile trip throughout the western/northwestern U.S. and we repeatedly discussed how pleased we are with many aspects of our 3 year old MKC, especially about how quiet it is at virtually every speed. Certain types of pavement will cause even the quietest of vehicles to "sing" or clatter but for the most part, we are pleased. Your use of the word "excessive" is something I've never heard used when describing the sound levels experienced in the MKC. I'd let the dealer have a look at it!