Mine is very quiet inside. I haven't noticed any tire/road noise. I've had Michelin All-Season radials before, and they provide a very good combination of smooth, quiet ride, good winter performance and longevity. Concrete highways are going to be noisier than asphalt. Manually check the pressure in each tire with a good analog tire gauge. Don't go by the pressure readout in the DIC. That reading is all over the place. Recommended pressure in all four is 35 PSI. Overinflated tires are going to be noisier than properly inflated ones. Remember, the air compressor that comes with your SRX can be used to inflate your tires "only", as well as for fixing flats.
I have very little road/tire noise. But I do have some type of "drone" between 75-80.
It is quite loud. It is almost like a exhaust vibration, without feeling anything. If I give it some throttle,
it goes away, but then come right back. Of course, that is my normal highway speed, so it is always there.
Thank God for Bose. But it is aggravating.
Have to say my 2012 Performance has way more road noise that a Cadillac should. I always attributed it to the 20" wheels and low profile tires, as there is less tire to absorb the noise. Have rented several Luxury models and no such noise. Wonder if an undercoat or sound deadening treatment would help?