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As I am the OP on this thread, I'll say that the ScanGauge was re-calibrated between testing the OEM tires and the "tall tires". As I recall, the OEM tires used -3% setting, and the "talls" +7%. In both cases, the ScanGauge error was less than 0.1 mile in 10 miles. AFAIK, an improperly adjusted ScanGauge will affect both MPH and MPG readings.
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