Gasoline by phone

Westchester County (New York) has a call-in service (914-995-8710) to tell you the lowest gas prices for the area. I just dialed the number and found that it worked pretty well when I asked about White Plains. Since most people care about gas prices while they're in the car, this seems like a great idea. Unfortunately the prices are updated only every 2 weeks (!) or so. They are apparently using the VoiceGenie engine.