I'd guess that my mileage was around 3K because my route is 4.5 to 8 miles long each way depending on the route. I got 3k as follows: 12 miles a day x 5 days a week x 50 weeks.

My HID disables my computer, so I stopped keeping track of miles I also take my computer off the bike when I run errand. In 2004, I carefully counted and got 4.5K in total miles. But it just got to be too much of a pain to write down mileage for the night, twilight, and bad weather commutes.