Most people have heard of Mapquest, but on its sister site gasprices.mapquest.com cheaper gas is just a click away.
All you have to do is type in your address and click search. In just seconds a list will pop up showing the cheapest gas prices in your area, but the distances may vary. That's why you click on the distance tab and then the closest gas prices in your area pop up. When you put your cursor over each listing, the prices for regular, mid-grade and premium pop up.