04.25.11: I have been using this free app for some time and it is saving me money, now that the gas prices are so high.
It uses the iPhone Locations Services, so it can list the gas stations closest to you to further away and/or from cheapest to most expensive.
It also allow for auto-switching to the maps app for directions to the station of your choice.
The users of the app have an easy way to update the data, when they notice a different price.
With these rising prices, I will be using more often.
Use the iPhone search tool to easily download this free app.