I don't do the mileage leaderboard posts because it's always the same for me, the last 4/5 years: 3650 miles/year commuting. A little under 16 per day, less if I take more surface streets.

For getting a decent ride in, 10-11 miles each way (my commute before I moved closer) was almost ideal. I like my shorter commute though because some days I'm not "riding" - I just want to get home.