I have a 1.6 16v.
Driving to work which is a 9 mile round trip I average about 43 mpg. Goes down to about 36 if Its been reset and I have a fun week.
Driving down the motorway I got 52.5mph at 80 - 90 mph all the way.
According to the book clios start to loose their economy above 3000 rpm so try staying below that and try not opening the throttle above about 20%.
Used to get 36 mpg driving to work but since doing the above I can even get it up to 47/48 if im really casrefull. On a full tank Ive seen a range of 700 miles before
(will admit i did a bit of coasting and had reset it a few miles before)