Two and a half years of figures for you:
http://www.spritmonitor.de/en/detail/352897.html
Around the 30MPG average for the whole of that time!!!
Gear ratios 5th and 6th have been raised from 16.1mph/1000rpm to 17.1 in 5th and from 18.9mph/1000rpm to 20.5 in 6th
late 2007 the final drive ratios in 5th and 6th were increased (only by a few 100 rpm). The box itself is no better, just helps the mpg slightly
At the moment i'm getting about 32mpg, which is a mixture of dual carriageway, town and country lane driving.
After the midlands meet and a enthustiastic drive with everyone afterwards my 172 got 32mpg, not sure if you wanted to know this but thought it might be useful as a comparison
Checked today, I have got an avg of 30.4 mpg over the last 8,000 miles. I dont flaw it everywhere but i dont drive slow either. mainly town and city driving with occasional motorway use.
My 197 cup is poor on fuel. Then again i drive with a heavy right foot. Do i care? Not at all, i have never owned such a great car in all my life. Even the mrs likes it and she normally couldn't give a monkeys about cars. Its a fight in our house as to who takes the Clio. 25MPG is very poor but the fun factor you get when driving it sure makes up for it.