60 seconds per lap in a 3:45 1500m.
That = 15 seconds per 100 meters
the extra distance in the mile is less than 10meters
1 tenth of 15 seconds is 1.5 seconds
If A person hold paces A 3:45=x<4:015
Just saying I think the conversion chart people come up with is Crap.
An elite runner can hold their average 1500m pace (we are talking even their slower first 2 laps) for another 100m.
If they couldn't they should have 100 bricks tossed in their face.