CES 2010 - Garmin ecoRoute hd Quick Look by GPSCity

Transform your compatible nüvi into a real-time diagnostic computer with ecoRoute hd. This easy-to-install device not only provides fuel and mileage reports, but you get more accurate fuel consumption/conservation data by tapping into your vehicle's diagnostic system. Calculate your carbon footprint, engine performance and more all through your nüvi.

USA: http://www.gpscity.com/garmin-ecoroute-hd-cable.html
Canada: http://www.gpscity.ca/garmin-ecoroute-hd-cable.html