The MPGuino is arguably more accurate than a ScanGauge due to the way it measures fuel use. Yes, it needs to be set up and calibrated to the individual vehicle, but so does a ScanGauge. Check the
Guino subforum for more information.
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Data points. I have driven this route in excess of 450,000 miles over the last 15 years. I would say thats a pretty decent set of data points to work with :-)
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As to why your mountains of data aren't showing you the information you're looking for, why not start a new thread and post the data? The topic of why you can't find more than a 2% fuel economy change by slowing 10 mph on the highway is threadworthy on its own.