Michelin Premier--Very Noisy After Rotation?

Thanks Sam. Mendel is correct, no arrow and not directional. Michelin customer service rep also confirms it.
You ever been driving beside a 4X4 pickup truck with those knobby tires? And that constant "hum" those tires make? Well, my car sounds similar, not as loud of course, but very similar and annoying. And now that darn vibration again. (I'm going out now to crank up the psi, and fly her around the city.)

 

I topped off the air. I am somewhere between 43 and 46 PSI. My old trusty Milton pencil tire gauge shows 46 pounds. And my new Accutire digital gauge, recommended by consumer reports magazine, shows 43 pounds. I only came 10 miles so far, and the ride is not as bumpy and harsh as I thought it would be. I stopped to take a walk at the pier. Here is what I am seeing.



Pretty gloomy and empty today. I keep going south I will end up in China? No, China is West of the U.S.

 

Very good information. Thanks again Sam.

 

Drove 40 miles over various kinds of road conditions; various speeds. Placebo effect again? It felt good, I didn't notice any vibration, the steering was crisp and precise, it tracks true & straight, didn't feel any overly harsh ride... and the tire noise? A little less I'd guess. Was I asleep? I'll test again when we get our 90 degree heat in a coupe days.

Factory specs is 36 front / 35 rear. I will probably back the psi off a bit, to 40. That's only 4 or 5 over. Leave it there.
Ok, thanks guys. I've bored you enough. Time to bury this thread.

 

42.

"42 is the answer to all things in the Universe." Thank you ETP. Where's he been? He was a funny guy. I enjoyed all his posts. I found the sweet spot for my tires, and 42/41 psi it is. My Prius is riding & handling great. Now I just need to find some rain... test the wet handling.

(I also washed and detailed and polished the Starship. And you wouldn't believe how quiet it is now!)