Efficient (foaled 23 August 2003)[3] is a grey Thoroughbred racehorse gelding, bred in New Zealand, who won the 2007 Melbourne Cup[4][5] and the 2006 Victoria Derby, both times ridden by Michael Rodd.
At his next start he ran fourth in the Group 2 Dato Tan Chin Nam Stakes behind El Segundo and Haradasun.
Three weeks later Efficient lined up in the Weight for Age Group 1 Cox Plate over 2,040 metres at Moonee Valley where he finished 9th beaten 6½ lengths by the winner El Segundo.
Reunited with jockey Michael Rodd for the first time since their 2006 Victoria Derby win, Efficient settled back in the field and travelled well.
He returned to racing in September 2011 but did not show any form until he ran second to Niwot in the 3200 metre Sydney Cup at Randwick in April 2012.