First, The CW an CCW on the roundabouts way TOO FUNNY, thanks I needed that.
As for the tire wear. myself and maybe a 100 or more co-workers used a parking deck with one of those corkscrew exits. We had to park on the top level (#7), and then corkscrew all the way down. The surface was very rough to improve traction (this was up north), and we actually did see some additional wear on the tires.
I cannot see the same thing happening on our roundabouts unless you are spending a LOT of time going in circles......
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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