Coventry was again beaten by Stephanie Rice in the 200 m individual medley, despite swimming under the old world record.
Stephanie Rice, the Australian world record-holder, may have been absent from Delhi but the diminutive Miley was a convincing winner in her signature event.
Australia's Stephanie Rice pulled away to a strong finish on the freestyle leg, as she claimed an Olympic gold medal in the event.
Together with Stephanie Rice, Bronte Barratt and Kylie Palmer the world record was broken by 5.78 seconds.
Women's 400m Individual Medley: Stephanie Rice of Australia, 4:29.45, (August 10)
Women's 200m Individual Medley: Stephanie Rice of Australia, 2:08.45, (August 13)
The principal is Scott Gray, who is assisted by Stephanie Rice as vice principal.
Stephanie Rice, who took three golds in Beijing and is back for more in London, looks like the next swimming legend in the making.
Stephanie Rice, the reigning double Olympic champion, who is set to return to 2012 in order to defend her double gold.
(This time was subsequently bettered by Stephanie Rice in the Olympic finals with a time of 4:29.45).