Damo,
I too have been keeping a record of my fuel consumption over a long period. I started with cat back exhaust and pod and have kept a record of when I did mods, long drives etc.
From memory im getting about 13L/100km in city type driving.
Mods include full exhaust, EBC set all the time at 0.6bar, high flow turbo, BOV, pod, clutch, tuned powerFC, FMIC.
When you post yours up, i'll post it in the same thread for comparison - mine is in excel format.
Mark