Two rounded-off lug nuts later, and I was frustrated. To Firestone we went, and had all 20 lugnuts replaced. D considered this insurance: if we spent this much money to make sure we could get the lug nuts off later, then we won't ever have a lugnut problem again. We can only hope.
Across the Firestone parking lot was McDonald's, whose sign advertised:
"Try Hot Soup Drive Thru"
We couldn't see the drive-thru window from Firestone, but we envisioned a large hose protruding from the side of the building, sufficient for spraying broccoli-n-cheese soup at cars driving by. HOT broccoli-n-cheese soup. We decided not to eat there.