So long as the vehicle has an OBD-II diagnostics port (and most vehicles from the mid-'90s onward do), Garmin’s ESP module can parlay vehicle information into a display on the GPS unit’s screen. The device monitors acceleration, braking, speed, and fuel consumption, and gives drivers an overall “green” score. Unlike typical OEM systems that provide the same data, Garmin’s device allows users to parlay their fuel consumption to a route map, showing which areas around town could stand to use some light-footed driving.