] Mashing up Google maps and Gasbuddy = locations of cheap
] gas in your area on a Google map (map or satellite view).
] Just choose a city- then the data on the right side is
] updated cheapest gas prices. If you have mobile high
] speed access you could add a GPS and have this running
] while you drive. In the future, maybe our cars will do
] this for us.

This is pretty useful, although there is nothing where I live. :)

Find Cheap Gas with Google Maps