The worse ive ever had is 47 MPG with mine. And ive only had that once, never ever got below 50MPG other than that time.
I am finding its getting worse on fuel, im not sure if my MAF is on its way out. I have heard that it can develop a fault which makes it use more fuel but still drives the same.
Even when driving fast i dont seem to get much less than thr 56mpg average really.
When driving eco in normal driving conditions i can only get the MPG up by about 3mpg so i dont usually bother
Although very long rund and 65-70 is achievable. But not lately again iim only getting 56ish on a good run now