I will once again restate an assertion I made in another thread "True Cost of Commuting by Bike" that anyone who is under the impression that bicycling to work as opposed to driving is a "break even" proposition at best or even the more costly alternative would fail a basic home economics course- if that is the case for you then you're either screwing up the math, spending a lot of money unnecessarily or not really riding your bike to work with any regularity. For those of you still struggling with the economics of biking to work or understanding the true cost of ownership of an automobile and the true cost of commuting by bike here are some useful links:
http://www.edmunds.com/tco.html
From Klipingers'
Originally Posted by Klipinger's
Our Methodology:
The per-mile cost of driving to work is 50 cents, including gasoline, insurance, maintenance and depreciation, according to the IRS' 2010 standard mileage rates. Actual rates may vary by vehicle.
The per-mile cost of biking is 9.6 cents and includes maintenance and depreciation, based on interviews with U.S. cycling organizations and previously published research, most notably from Road Kill: How Solo Driving Runs Down the Economy.
Monthly parking fees are broken down to a per-day average on the basis of 19.3 workdays per month, a figure derived from Bureau of Labor Statistics guidelines.
And this site might be helpful-
http://andyjordans.com/page.cfm?pageID=207