I have a 2015 MCS that is one year old this month (automatic). I went in for my annual service today and the report states that all the tires measure 6mm with the recommendation that they be inspected on my next service appointment. My car only has 2300 miles on it, so I was wondering if 6mm tread is excessive wear or normal. I never had to replace the tires on my previous two Minis after owning them for 3 years, and around 23,000 miles on each when I traded them in. Thanks for any responses.