I happened to test drive 2010 Q7 diesel with 41K milege. The car has LOUD engine, wind, and road(old tire)noise. 2012 Q7 3.0T is better in terms of accelation(high speed range) and quiteness than that THREE years old car. I do not want to drive Q7 diesel home unless AUDI has improved a lot on its diesel tech in past three years.