BigNic,
Fuel consumption hasn't changed. I know this doesn't make sense, but i've not noticed a difference. I get about 12.5l/100km or 7.5km/l.
I use 100% waste vege oil, so I cannot measure my exact consumption like others can with an accurate bowser fill, but I DO measure my fuel into the tanks.
The performance boost is really special. The fuel screw is your greatest friend. Once you've tweaked your fuel screw, you will buy a pair of 10mm ring spanners and a 3mm allen key and set them aside just for adjusting the fuel screw - probably wrapping them in some nice leather to keep them new and worship them appropriately.
Tim