Following up on the New Yorker article last August, there still seems to be operations producing fake olive oil: http://news.bbc.co.uk/2/hi/europe/7360434.stm
Remember to ask me, and on the tours I will explain what to look for when buying olive oil to make sure that you get the real Extra Virgin Olive Oil. When the Chianti tours fill up we may be able to visit an olive oil farm.