It seems to be just me and my family, but we've tried Michelins twice on our Grand Marquis. BOTH times, they were great tires for the first 6 months. After that, they were the slipperiest tires I've ever had, bordering on dangerous. The ones I had were the X-Ones. A tire shop convinced my sister to get Michelins, a different all season this time, but again, after 6 months, the slipperiest tire ever! No one else that I've talked to has experienced this. Perhaps Michelin designs tires for front drives which have the weight of the engine on the driving tires, and don't care about rear drive traction?
The BEST tire I've ever had was the Dunlop D60a2, I think it was. It was a performance tire, but it lasted with great traction for years.
Larry