450 miles via US 340, I-81, I-40, I-75 and TN 30. Cumulative route miles: 999. Auto miles: 467. Cumulative auto miles: 1092. The extra auto miles were due to the visit to Luray Caverns before we left the farm.
Actually, the route wasn’t quite this simple as the GPS detoured us near the intersection of I-40 and I-75 due to an accident. It added some time but didn’t affect the miles significantly.
This was a long hop, but the weather was good and, outside of the accident/detour, the traffic wasn’t bad.