Has anyone run these for any length of time? I am looking for replacement tires, as my Mastercrafts have only lasted around 40k. After hours of reading, I think that the Michelins would provide the best mileage for my application, yet I was wondering about the Dura Grappler, as it is advertised as a long wearing highway tire, yet I haven't heard any numbers that people are getting our of them. Thanks