We Raced To Visit The Most US States In 100 Hrs - Day 3

Does the $100-110 you have to spend at Bucee's include fuel you put in your rental car so that when you return it at the airport, the tank's still at the same level it was when you started out?
And what's to stop you picking up a rental car during the rest period, then parking it in a car park near where you need to be at the end of the rest period? You can pick up food in a supermarket during the rest period, surely, so why not a car?
You could rent a car at Dulles, then take the Auto-Train from Lorton, VA, to Sanford, FL; I'm sure there must be some levées round Lake Monroe.