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Larger tires comment
It seems to me that the author's use of the Scan Gauge to correct for speed and distance speedometer/odometer errors introduced by the tire diameter change is a reasonably accurate way to address this problem. Many commenters have gotten 'out in the weeds' discussing effect of the diameter changes.
It is expensive and difficult for an individual tester to control for the differences in rolling resistance introduced by using different brand tires with different designs.
I observe that even when using substantially similar diameter tires (different brands, too) when switching to winter tires each year, that my mileage is negatively affected beyond that caused by long warm ups and colder temperatures.
To my knowledge the tire industry has yet to develop an industry-wide standard and test for rolling resistance.
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