Our expert says:
Not sure. Perceptual difference, maybe? Perhaps the controllable pace on the treadmill allows you to find a 'groove' and then just keep going at a steady pace. Perhaps your actual speed outdoors is different, and the terrain is affecting you. There's certianly no physiological reason for this difference, it's not as though running outdoors is harder than on a treadmill, unless it's very hilly or windy. So all I can suggest is that it's a difference in the pace and the controlled environment offered by the treadmill.
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