Originally Posted by nhdoc

....Also, you didn't say clearly where the worn tire WAS while it was wearing but if it was on the right rear then I can tell you I have noticed the exact same thing on my W210 and others too have said this. If it was on that corner the whole 18K miles it will wear much faster on the right side than on the left side, it has to do with the open differential. Now I rotate mine every 5K like clockwork to avoid that....