I have ran the needle way past zero before and went to 375miles, I managed to get 61.5 litres in so there was only 1.5l left.
I used to get 25mpg every where with mixed driving and the occasional blast. After porting polishing and opening up all the choke tubes and cleaning the injectors I now get 27mpg for the same driving.
On the motorway, with the wind behind you without moving the throttle at 80mph, I have got 34mpg.
If you razz it I have seen about 11-14mpg.
also 50mph in 5th around mountain roads in scotland gave 31mpg which was pretty good considering all the lazy throttle mashing rather than changing gear.
The best quote I ever saw after a review of the 164 QV, was "From now on I am only going to buy cars powered by Alfa V6's"
Mmmmmm The noise, the noise...................