I spoke to a friend of mine who is a salesman for Ford, he was the one that sold me my current Focus. I mentioned some issues with mileage that are documented in here and I asked him if he has heard anything. He mentioned he did hear of one, and they requested 10 receipts showing the fill ups and the amount of km driven on each fill up. The mechanics will then have some data to look at, he was not aware of what the results of the fix was.
2012 Focus Titanium Black Manual