Front tires are continually wearing on the front outside edge. Wearing until bald in first 15000 miles of ownership, multiple front end alignment calibration tests and actual front end calibration not resolving issue. Front tires replaced at approximately 23,000 miles and again wearing on outside edge at 40,000 miles. Worse on driver side. Contacted dealer several times for resolution and contacted GM twice to open ticket. Last GM ticket was 8-4030406653. Tires are Michelin and are supposed to last 65,000 miles. Never seen this type of wear on any past GM vehicle owned. Rear tires are in excellent condition. Unable to get dealer or GM to find cause and resolve once and for all. Tired of paying out of pocket alignment costs. The front tires are on the second set and the current vehicle mileage is 42K. I have attached images of front driver side tire which has greatest wear and image 20180328_113012.jpg is the original back tires which have no wear. Front are the second set since purchasing vehicle. Original set was completely bald on outside edge before 19K miles.

- Goose Creek, SC, USA