I can't dynamat the firewall. I didn't want to drive a diesel around at 2600 RPM. I'd rather get 16.75 mpg and be quieter with less wear than get 14.5 mpg and have some of the noise blocked by a hundred or so lbs of dynamat.

Trust me, I considered everything. The thing now is that I used to equate speed with noise. Now I pass some jack ass going less than the speed limit in the fast lane only to look down and see my speedo pegged and I'm only at 2200 RPM. It's great.