At 14k miles, my OEM Goodyears on the 19" wheels are starting to get louder. The tread is about half gone. I'm wondering if anyone has switched to the Michelin Primacy tires that Tesla is now offering as an option and claiming to provide 3% increased range on your charge. Are they really quieter? Is there a loss of handling to go from a high-performance all-season to a grand touring tire of the same size? Current prices at tirerack.com show the Michelin Primacy to be about double the Goodyear RS-A. Thanks for any opinions and input!