] 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.

I was just able to use this to find two local gas stations with sub-$2 a gallon prices. And this is in Jersey, so that's full service.

Find Cheap Gas with Google Maps