First of all, I love facts like this, good post.

I'm around 6:30 most days. Perhaps an interesting point though...when I used to commute to and from an office building, it was never before 7 pm. Usually wasn't even possible and often closer to 8 pm. And then the weekend restaurant schedule would be a reservation around 7:30 at the earliest. I'll bet there are some interesting cuts of the data behind the averages (urban/rural, kids/no kids, etc.).