New condition looks to be never worn. If you have any questions or need more pics, please send me a message. Check out my eBay store for more deals. Thank you for looking. The Milford Proving Ground (MPG) is the lead facility for GM’s global proving grounds, responsible for product development and durability testing for GM’s North American and global products. MPG was the first dedicated automotive testing facility in the world and remains among the largest and most comprehensive of such facilities in the global automotive industry.