This is a rough estimate, but since I moved here I have biked just shy of 400 miles, and I've driven about 200. For some reason, it is easier for me to bike here than it was in Corvallis!
The Bike Communte Challenge is going on right now. Work places sign up to be a team, there are 1200 registered in the Portland area. For the month of September, commuters log their mileage by bike on a daily calendar. The total number of employees at the establishment are calculated with the total number of commuters in the challenge, along with their rate of cycling vs. driving to give a final percentage. Right now, my team as the Portland State Office Building is in 8th place!!!!!!! Being mostly comprised of Department of Human Services and Public Health
employees, I would sure hope so.
Here's a screen shot of my personal Bike Commute Challenge homepage. It shows the mileage total for the month (my work commute only), the calories I have burned, the carbon I have saved, and the percentage of time I bike.