I didn't post this in the car free section, because I am not car free - just one less car. I had two vehicles, one that was paid for and one that was not. Between the two of them I put less than 10,000 miles on them last year when I wasn't riding to work. One was used mainly for camping and carrying our kayaks, the other I drove to work less than 15 miles round trip each day.
Recently I have moved and am now less than seven miles from work in a good weather climate (North Texas). I have challenged myself to commute by bike 80% of the time from May to the end of the year which means there would be even less mileage put on them. It just didn't make financial sense to me to make a car payment on a vehicle that might get driven 30 miles on a few Saturday errands while my other may get driven even less.
I drove to carmax last night and got the newer one (the one with the payments) appraised and was happy to hear they were offering me more than what I owed. Considering that I will likely be driving less than 200 miles a month now it made sense to sell it. The $350 a month payment is now gone as well as my insurance being lowered by almost $50 so I am pretty happy with the choice. Almost $400 less going out each month, I still have a well maintained paid off vehicle (Toyota 4 Runner), and my girlfriend's car gets upper 30's mpg for any road trips where we don't want to break the bank at the pump.
In regards to commuting by bike, I feel like this is a positive reinforcement.