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Here's the way this works:
When it comes to tires, there is a HUGE!!! range of rolling resistance WITHIN a given size - on the order of 60%. Time spent carefully selecting tires (meaning make and model) that fit your needs pays benefits.
By comparison, tire size by itself has a very small difference in RR - on the order of single digit percentage. So one would do well to research the tire (meanng make and model) rather than size.
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