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Update on Jay Darrell Ingleton:
Miles/km mix up?
Saw one bloke using a treadmill in the work gym a few years ago who was confident of a sub 3 marathon as he found running at 9.5 "mph" easy, until I told him the treadmill worked in kph. When he tried 14.5kph he was able to hold it for about 2 minutes.
Update on Jay Darrell Ingleton: