Approximately 3,600 miles on my odometer as of August 1st.
425 since New Years, which is only 12.5 a week, but I didn't bike at all between the New Years warm spell and some time in April. Assuming April 1st, that's a more respectable 20.2 miles a week since then.
But since I was away for two weeks this summer, that's more properly an average of 22.3 miles a week.
Since my round-trip commute to work is 4.26 miles, I think that's a fine average.