Used retail days’ supply was estimated at 37 days in September. Normal days’ supply, which Cox estimates using data from its vAuto inventory-tracking software, is 44 days. Wholesale supply ended September at 18 days. A normal wholesale supply is 23 days. Used-vehicle inventory levels have been faring far better than new and in fact have been inching toward normal levels as of late, Smoke said. “New inventory as of mid-September was down 75 percent compared to 2019, with days’ supply down a little less, as the declining sales pace has kept days’ supply at its bottom for the last several