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We took this photo to give you an idea of how accurately ScanGauge II captures OBD-II info in real time. Take a look at the needle on the tach, then note the rpm reading on the screen. MPG is reading 0.0 as the test ’Stang was parked. However, results of our road test confirmed the unit is equally as accurate when recording trip information (max speed/coolant temp/rpm, average fuel economy, trip-fuel cost, and so on).