I have commuted about 900 miles this year, which I started in mid-August. 12 miles roundtrip. Now I wish I had kept better track, because it may have been more! I averaged anywhere from 1-5 days a week commuting, typically 4-5 days.

I would like to get some studded tires (like Schwalbe Winter Marathon or something like that) for ice, but we'll see. Right now I don't ride on days there's lots of ice (in Denver, we have that luxury, as ice tends to melt pretty fast).