guys - I think I have good news for all of you - let's hope this IS the case. If so, Tesla is working on a permanent fix. and for now, they have given my less than 2month old car a fix that seems to be working.
It has to do with the front bumper air dam area and wind. At certain high speeds, the wind flow is strong enough to flap the lower & inner area of the bumper. This will start off as a noise in the front area, and then add vibration to steering wheel. I had it the whole time since I picked up the car from factory in October, with 9miles on it. First time, I took it in November, they replaced one wheel and rotated the tires. Car had <2K miles on it. I took it back and had the vibration still.
Then I got another appointment last week and Shaun, from Sunnyvale Tesla Service Center, had a feeling it had to do with the front facia issue that he had seen on some other newer cars. He went on a test drive and was fairly confident that was it. He heard the noise and also the vibration.
I got the call back this morning (Monday) and they had fixed it. No more noise/vibration. Finally, after 2months of ownership, I am able to enjoy the car at highway speeds.
There is more to it. I overheard two techs talking that Tesla is aware of this issue, working on a permanent fix, and in the meanwhile, I got a temporary fix. They had to remove the front facia, work on the lower section to channel the wind appropriately, and put it back together. I was concerned my paint protection film would be damaged, and he assured nothing would be harmed, and he was right.
I am thinking many many more new model Ss coming out the factory (perhaps starting Sept-Oct?) are likely affected by this!