Can the ScanGauge II show if there is a difference in MPG between using my truck with the windows or tailgate up or down?
Yes. It is important to drive the same road at the same speed going the same direction. Follow the proceedure in the question above, setting the cruise control at the desired test speed for both trips. Begin and end each test at the same points on the road. Pick a day with no wind as wind speeds vary and can affect results.
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