It's not bank vault quiet but in my experience on blacktop, going 75 mph with the stock ATs (or now on snow tires - Michelin X-ice) there is no problem holding a conversation with passengers or to turn the radio above 50%, it's never been fatiguing to me as a driver over several thousand miles of interstate travel so far. Engine noise is only thing when you are pedal to the metal passing or trying to maintain high speed up an incline. Wind noise seems very dependent upon if there is a head, tail or cross wind. There is a low howl/moaning sound that comes from the lower corners of the windshield when the speed and outside wind direction are just so but it never gets out of control and certainly never as loud as my FJ. What I notice most is the tire noise of other cars passing/being passed on the interstate. I don't hear it in commuting traffic, which is usually slower, but on road trips at full speed I sometimes find myself checking to see if there is a window cracked open a bit because the sound is markedly more noticeable than the noise floor from the LC itself. Don't know if that is the lack of acoustic glass or lack of sound deadening materials in the door. Probably both.
