I drive in Monday and out Friday for a couple reasons. 1.I only have on-street parking where I live and no garage or drive-way. At work we have underground parking, so my car gets to chill out during the week out of the elements and don't have to worry about moving my car for street cleaning and getting a $60 ticket. 2. Gives me the option to go someplace after work that is unplanned/out of the way/bike unfriendly. Sometimes I go to a family memeber's house after work and am there until midnight and then would still have a 15mile ride home at night.

I wouldn't do it if we didn't have free underground parking at work.