Consider how you use your car. Now consider how you use your bike. Can you do things on the bike that you normally do with your car? Most likely...it'll just take a bit longer. Take mass transit or a cab for errands too big for your bike. I wish I could go car free but at the moment I need my car. If I lived in a big city and never had to venture out of it, I'd go car free. If I was single and had no kids I'd be car free. And only rent a car for holidays and travelling.