
MPG 100: GM employees celebrate the centennial of Milford Proving Ground
Rarely open to visitors, Milford covers 4,000 acres and features nearly 150 miles of roads for testing GM vehicles. Guests at the event were offered a self-guided tour of the facility, which includes a 2.9-mile racecourse, steep hills, both paved and dirt roads, and a 67-acre swath of blacktop known as Black Lake.