Man, you drive WAY more than me!! Oh wait....I work at home, no commute :D.
Anyway, just wanted to chime in again on the sound deadening. Dynamatt is WAY overpriced. I used RAAMmat, 2 full rolls in my car. It's great stuff because it does exactly the same thing Dynamatt does for a fraction of the cost. http://www.raamaudio.com If you want to put sound deadening in your entire car this is the way to go. It's takes many many hours to install though....all for a VERY quiet ride :D.