With gas prices increasing like they are these days, everyone could use a break when doing a "fill-up." This little tool can prove to be quite helpful ... and it does work! You may want to pass it along to others. You merely input your zip code and the program automatically updates with the cheapest gas prices and locations in that area. Gas Prices - MSN Autos Don't think it works for areas outside the U.S. And not all gas stations participate, I'm sure.