Gas prices can widely vary in an immediate area. I have used it on my trips and found it to be useful in finding the lowest prices wherever I was. When we were in Maine last summer, prices in a small area varied as much as $0.20 per gallon. The app also gives directions to get to that gas station as well. Just make sure that a passenger is doing the search for you or you have pulled over to the side of the road if you are doing the search yourself.
So give the site a try and/or add it as an app to your smartphone and start saving. You may decide that you too wish to become a contributing member and help yourself and others find the lowest priced gas in your area.
If you have further questions or wish to know of other apps that may be useful to you, please call me at 917.572.3468.