My commute is 60 miles round trip. By not driving over the hill just one day a week, I’d be saving myself about 3000 miles of driving every year. Now I get 50 mpg (yay Prius!), so that’s about 60 gallons of fuel, or about $180. Okay, when I was working that out in my head, I decided it was $1800 I was saving, which is off by a little, but still! 3000 miles I’m not driving every year. That’s fairly awesome.