A few days ago I purcchased my first MB, a 2007 C230 Sport Black on Black with only 20,550 miles. I love everything about this car except for the interior noise level. I expected a Mercedes to be very quite but even though it rides very smooth you can really hear the roar of the tires on the highway. I also have a 2002 Toyato Camery and I think the interior noise level is quiter in it than the Mercedes. Is this common for this model car or could there br some other problem causing the high noise.