I have a unique schedule, where I work from home Mondays and Fridays, so I use my lunch hour to ride. I can also start work earlier on those days (since I don't have my 90min commute) so that stretches the lunch hour out a bit.
Anyway, I usually do something like this:
Friday & Monday: 35mi @ 16-18mph avg.
Saturday & Sunday: 65-70mi @ 15-17mpg avg.
(there are no flat roads around here, and the summers are hot and humid)
For Tue, Wed, and Thurs, I usually take 1 or 2 of the days off, and on the other days I have some short rides (15-25 miles) that I hammer out at close to a 20mph average.