GasBuddy lets you search for Gas Prices by city, state, zip code, with listings for all cities in the USA and Canada...
Publisher: GasBuddy Organization Inc
This mobile web site can be pinned to your Windows Phone Start screen and accessed seamlessly using WebApps for Windows Phone. You can download WebApps from the Windows Phone 7 Marketplace or the Windows Phone 8 Store, or by tapping the "Access using WebApps" button above.