It also depends on how much car ownership and use costs each person. Some people pay hundreds a month just for parking. For me, I'm driving a 12 year old minivan that has long since been paid off and I do all the maintenance on it. It costs about $100/year for maintenance - oil, wipers, tires, and about $75/year for registration and $500/year for insurance. So that breaks down to about $60/month if the car just sits there. I haven't paid a dime for parking in years, anywhere. There are some places around here with parking meters but I haven't had any need to go there for years.
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Work: the 8 hours that separates bike rides.