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I think it was Dan John. S&S page 57, "The swing is inefficient, which is why it is a great fat burner," explains Dan John. "The bike is efficient -- and fat people can ride it forever."As Pavel says 'a fat man can ride all day on a bicycle'
I agree with @offwidth though. Not very meaningful. The bike is plenty of work no matter what you weigh. It all depends on how far and how fast you go.