Monday - Bicycle
Tuesday - Bicycle
Wednesday - Car & Bicycle (AM carpool)
Thursday - Bicycle
Friday - Bicycle
I bought the Drifter (Surly Long Haul Trucker) a year ago this July, and have been tracking my commutes in a Google Doc since then. I'm in the assurance business and not usually the one making the assertions, but here goes:
For the one year period beginning July 1, 2008 and ending June 30, 2009, I saved a total of $364.75 riding a bicycle to work.
Here is the basic methodology that I used:
For every one-way trip taken via bicycle, I assumed savings of the equivalent of an applicable bus/light rail fare (rush hour, non-rush hour, downtown zone fare, etc). This is the alternative for me since I rarely drive by myself if I'm going to the office. Someone with a regular commute involving parking expenses would save significantly more.
Resources:
A visual representation of my commutes:

Underlying data:
Google Doc Tracking Spreadsheet
I'd be interested to know if this seems like more or less savings than you'd expect from a year's worth of bicycle commuting?
