I'm super jealous! I'm minutes from the Biltmore Estate near 13 on your route. Give me a shout if you want to meet up.
What's your plan for this trip- mostly back roads or Interstate, camping or moteling?
5 quarts brings mine to the min mark then I add more without the running procedure till it hits where I want it. Then the next day I check it and its right at the level I left it the day before. About 5.5 liters will put u at the top which is where I set mine.