From what I understand the scan gauge doesn't have a clock in it. So the previous day info only changes if the vehicle sits long enough. They claim 8-10 hours (overnight). So far I've racked up about a weeks worth of driving in the "Today" mileage. And the previous day info remains blank. Seems to me like a good place for improvement for the next model ScanGauge.
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Adjusted for my driving habits. 80%city/20%Highway.
20mpg city/30mpg highway or bust! Check out my mods so far
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