I know that this has been mentioned in the past but worth bringing up again.

I have been relatively happy with my mpg in the 3.2, seemed to be the same or a bit better than my 3.0 BUT that was according to the ICS - Calculated it myself after filling up and realised that the ICS is reading 3 to 4 mpg more than the real figure The 3.0 ICS was fairly accurate, the 3.2 not. I just filled up and checked again - ICS said 30.7mpg, calculated out at 27mpg! The half tank before that was only 20mpg

Oh well - annoying that I cant trust it. Probably worth checking yours!