You know, I noticed something. The distance between the Recaro Rush and the Mustang vs. Mustang races is somewhere around 3 kilometers. Judging by that, the whole map would actually span roughly 15 x 12 kilometers. That's 180 square kilometers or 112 square miles.
Just a rough estimation, but the mao sure is bigger than the "63 square miles" that have been brought up. Just wanted to get that out of my system, really.
Also, it took me about an hour to drive on 12/219 roads in the demo. Drive on the roads themselves, mind you, let alone fully exploring the map we're given. Going by that, I'd have to spend something like15 hours or so with just driving along in order to drive on every road. Just to fully uncover the main roads.