The thing is that the tires do NOT have the same diameter. They even say it : "speedometer error". There is 2% difference and that cannot be disregarded when you're measuring something at 0.1 mpg.
Quote:
Originally Posted by GreenHornet
If your goal is MPG then you want a light weight, tall, and narrow tire.
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Why tall? Because of better rolling resistance? Taller tires are heavier and make worse aero. Big gearing should be done with the gearbox, not the tires.