Thanks for the support. It's nice knowing so many people follow me (I also get a lot of mails).
4,6 l at 80 is pretty good for that type of car considering the size of the engine and bad Cd.
I currently drive a Peugeot 305 wagon 1.8 turbo diesel (maintenance on the AX) and I get around 4,5 l at 90.
I hope for you you can get such good figures, but you'll see it's not easy.
It's surprising a test returned only 3 l on the AX, usually car testers drive rather fast. Do you happen to have this test on a file ?