I saw this being discussed in another thread, but the main topic was gas mileage and I didn't want to derail it any further. My question is: How many Nox/Terrain owners have noticed that their vehicles are exceptionally quiet in all conditions except for highway speeds over certain types of pavement? I have the 17" wheels, and the standard Michelin Latitude tires don't seem to be the type to create excessive tire hum...yet they can be loud at times. I wonder if it is because there is so little other noise (wind/engine etc..) that it makes the tire hum seem louder than it really is...or did GM just skimp on wheel well insulation for some reason. If the underside of the wheel wells are accessible, it seems that we could cure this with some strips of Dymat material (used to quiet computer cases) or something similar along with some adhesive. What do you guys think?