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3. Stay out of traffic.
Google Maps, which comes preinstalled on many smartphones or is available for download, offers an at-a-glance display of road conditions in major cities to help you find the best route around congestion so you don't burn up extra fuel in stop-and-go traffic. Color-coded lines correspond to the intensity of traffic: green for no traffic jams, yellow for medium congestion, red for heavy congestion, and red-and-black for stop-and-go. Google Maps Navigation, offered through Google Maps for Android, has recently been updated to offer alternate routes to avoid tie-ups.