I've put together a spreadsheet/pdf matrix of drive times between all of the places I am considering visiting during a 1 week trip in Provence. I've also done the same for the Dordogne. While it was made specifically for my trip planning, I would be happy to share it with anyone who may find it helpful or interesting. Since I cannot find a way to share it here (via screen shot, attachment, etc.), please send me a message if you would like a copy in excel or pdf formats.
-Matt