I do 160-200/wk.
3-5 days commuting is 20 each way, 3-4 times and usually a 50 mile group ride on the weekends.

Average speed is going to depend on the terrain, and weather. On the flats I cruise 25 give or take, and hills can kill this. My last coast ride was 30 miles at 22 average. Last club ride was 19 average because we were dropping to 14 or so on the climbs. My commute is 17-19 average but with a good mile of 7-8% in the middle of it. A better measure would be average power output, but then we'd all have to have power meters.