I switched Econ off for the last tankful of fuel, and I can't really see that it's made much difference to anything, although the car seems a little more responsive, but economy is about the same - I am being light footed.
I'm getting around 60mpg according to the probably optimistic computer, mostly local journeys. My best so far was a motorway trip of approx 2 hours - 63.7mpg with 3 up and luggage.
Could it be that Econ only makes an appreciable difference to those who do not normally drive in an economical way?