Well, I have nearly 1,000 miles on the C-Max so far. Right now I am averaging right at the EPA of 47mpg. That is a total average with very mixed driving and my wife and I sharing the miles (she has no clue about hyper-miling). When I drive, I am typically well over 50mpg. 52 to 53mpg is not that terrible to achieve with just a little effort.
I will keep you all posted as I get more used to the car.
Matt