How are people's tires holding up. I have a little of 20k miles on my 85D, delivered March 2015, and my tires are getting low. I'm on 19s with the Michelin Primacy tires. Fronts are around 3/32 and rears are a little more than 4/32. I'm leasing so would rather not spend this money, but don't think I am going to be able to get through the colorado winter. I am looking at Continental Extremecontact DWS, as the tread pattern looks a little more aggressive to handle snow.