I've had this problem with almost every car I've owned. Leather seats, cloth seats, even vinyl, it didn't matter.

Interesting theory on the tires. Could be, I don't know what to attribute it to.

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Learn as though you will live forever.
-Ancient Hindu Proverb
(Are there any modern ones?)

1998 E320 Blk\Blk
1995 BMW 530i (bad engine) sold
1989 BMW 535i sold after 170,000 fun miles
1996 Lincoln Town Car (6 passenger land barge, still smooth and quiet at 130,000 miles, make me an offer!)