We dont get anything like that ever whether round town or on motorways. We have the 2.2 175 version but up to 3000 miles the average was around 37mpg and on our recent 3000 mile trek round europe it was low 30's. We are not impressed at all with the fuel economy.
I have noticed two things about the fuel economy on this car
1) it is incredibly sensitive to how heavily you use the throttle. I am not a slow driver but I have learned to temper my exuberance on occasions if I am trying to achieve a decent mpg. For example, I filled the car up yesterday about 10 miles from home and reset the gauges. About 8 miles in travelling x-country I checked the readout and it was showing 53.5 mpg when I found myself behind a "slower" vehicle at which point I accelerated past and kept going. In those last 2 miles the average for the trip dropped from 53 to 51 overall. Not exactly a scientific test but once again demonstrating the sensitivity of the throttle. I do that particular run quite regularly and average 48-50 mpg over the life of a tank but if I decide to use the revs at all the mpg easily drops to 42-44.
2) I have also found the car to be quite sensitive to fuel quality. Now I know there are many people who don't believe the adages about branded and supermarket fuels but as I have stated elsewhere I spent the last 26 years of my career in the oil industry including 11 years at a research lab where we developed fuels and lubes so irrespective of others opinions I allow that to influence my purchasing behaviours. Hence the car rarely has supermarket fuel in it more typically using Esso or Shell (because that's what's local to me). As stated above my motorway economy is 40-44. The 40 is generally achieved with standard fuels but a few weeks back I had to make a round trip to Newcastle and back (600 miles) so just for a change I used Esso Supreme and that's when I achieved 44 mpg. The journey up wasn't great, lots of hold ups, but on the way back down the car sat at 80-85mph for most of the journey.
Might be worth trying a different fuel if you are using supermarket fuel, you have nothing to lose.....