Find Cheap Gas with Google Maps | Make:
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. Via Robotwisdom. Link.
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