On the website of the Automated Trading Championship 2006, the
"Statistical Report #4" has been published. This statistical report gives analytical results for 25 most profitable Expert Advisors as of the 7th of December 2006. The following characteristics of the Experts were analyzed: profit in points, efficient factor, amount of closed positions, position holding time average, percentage of profitable positions, total profit and loss, expected payoff.
Its interesting: there is no expert with the efficiency factor exceeding 20%.
Hope this information will be useful.