I've tracked every gallon of gasoline I've ever put into the car and there hasn't been any noticeable decrease in mileage. I drive about as aggresively as you can in a Civic sedan and still get around 30/38, so I'm happy. Really quite and the music sounds sweet - all I could ask of a daily driver.
eh, my theory is, through a cold air intake on it, and get enough horsepower to make up for the sound deadening.
Also, much like your theory with the super model, I have a very similar theory. I keep 100+ pounds in reserve for a body of someone I eventually snap and kill. Seeing how this is very illegal and very horrible. I figure my sound deadening can borrow that weight for the time being
So I have been realizing, and joking around with my sisters fiancee about.
Always remind him that if he steps out of line, my trunk will be where he is headed, and no one will be able to hear his muffled screams,