I tested what I could average in my girlfriend's 133 and it did really well.
Left before 6am so no traffic, from London to Bristol, about 120 miles. Steady 65mph all the way and it achieved just over 45mpg. That's with about 1,500 miles on the clock at the time, would expect that to go up as the car runs in more.
Round town I haven't really tested, she's not a particularly spirited driver and I'm even fairly light footed, 35mpg as Ollie mentioned sounds pretty good.
My old 172 used to show 34mpg most of the time on day to day driving, my Megane struggles to show 22-24mpg when driving it normally!