It's definitely tire related. Most of the SouCal freeways are grooved surfaces and the howling noise is horrendous on long trips. You can really tell about the interaction of the tires and the road when you suddenly hit a mile or two of smooth asphalt and the noise level drops about 20 db. A tire's noise level rating will be very high on my criteria when it is time for new ones. I wasn't expecting the 370Z to have an interior noise level like a big Lexus but it does detract from the comfort on long freeway touring and also makes conversation a bit difficult at times.
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