Nowadays with sky high gas prices, it definitely pays to live closer to work. The average cost to fill up a tank for my car is about $50, and when I used to live farther away from work, I would fill up weekly. This came to around $200 a month, or $2400 a year. When I started carpooling, I was only filling up once every 2 weeks, so my cost halved, to $100 a month, or $1200 a year. Then I ended up getting a job much closer to where I lived, and I only had to fill up once a month, cutting my costs in half yet again to $50 a month, or about $600 a year. So I was able to save $1800 a year, just from gas costs alone. This is not even including the savings on maintenance/oil changes for the car which need to occur every few thousand miles.