I noticed the same thing, but only on my front right summer tire when I took it off in November. A little ridge worn into the tread area for about an inch in from the side. It looked like it could have been from the spring seat on the Koni strut, but there is no contact when stationary with wheels straight or turned. I have 215/45/17s on for the summer and 225/50/16s for the winter.
Maybe it was only making contact (at least in my case) while going around hard left turns... maybe at the track? I never heard it rubbing that I can recall.
Anyway, yes, I believe I know what you're talking about.
