Widewing,
Must have been a different report as the one I am thinking of gave actual separation distances. I seem to recall that the distance was measured either in ten second increments or after 30 seconds. Something like that in any case, but it did not give a vague "Far Superior" type of response.
Miliian's last post gave some idea of what it looked like. In his example an airfraft with twice the weight was a mere 27mph faster after 10 seconds. Now the A6M and US aircraft tested wouldn't fit into that simplistic a model, but it gives an idea.
The dive for an F4F or Fw190 was not an instant, automatic, free escape.