I have not rotated the original Michelin Cross Terrain tires on my Toyota 4Runner SR since purchased in July 2004. Still tread left on front tires, but back ones have very little but with over 100,000 miles I couldn't expect much more. The Spare is brand new (never on the ground). But with age-related weather cracks, not good to put it on the ground now. Not sure whether the Road Noise is because of the tires or the age of the 4Runner. I thought about driving it until the first flat, then buy 4 Michelins. But driving on turnpikes/freeways a lot, I've decided that wouldn't be very smart. So I will order Michelins from Tirerack.com. Tried putting actual miles of 100,465 but the form won't let me.