I'm not car free nor really that close to it, but I do commute to work every day of the year by bike, so in that sense I am car free.
I don't think of it so much as a commitment, but a lifestyle choice I made years ago and now it is just second nature. I have a perfectly good car in the driveway, but I never consider it a way to get to work (unless I inure myself playing basketball or something).