I'd spend more time finding the 'upsize' that helps to get the best mileage....but that's me.
You can buy used garmin gps all day for $50-60. And get the exact mph without trying.
I realize some are obsessed w/ the speedo being 'correct' but that is 'limited inside the box' thinking. If you can pick up 5-7% taller tire and drive down the final rpm at cruise.....why wouldnt you?
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