According to a Track and Field News article Paula will run
more 1500m in attempt to lower her 4:05 pr close to 4 min flat (she stated she have run 4:02 a couple times in pratice).
Haile Gebrselassie has the best marks with his 3:52.39 Mile on 27 June 1999 and his 2:06:35 14 April 2002. (his 3:31.76i indoor 1500m equates to 3:48.26yi)