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yah, the site is goofy, they compute the wheel speed @100kph for the stock tire, then use that to compare to the new tire. But at 62.14 mph indicated, you will actually be going 65.14mph with the 185/60r15s. If you want even taller "gearing" then go with a 185/70r15, though the extra width probably isn't going to be helpful for mpg.
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