Ouch!
My 2.8 used to average around 25mpg according to the on board computer and better on a run. As one of the real mpg saddo's, I've got nearly a year's worth of data on the S8 - every tank for around 20K miles - and it's averaging a little over 21.
And I can even find data to end the arguement about getting better mpg from premium fuel (BP Ultimate, etc). You do get better mpg - about 3.5% according to my figures - but that's not quite enough to compensate for the price hike (although the 'looking after your expensive engine' arguement still holds). In effect, if you take into account the better fuel consumption, the premium fuel costs about 2p per litre more than normal fuel.
I really must get out more...
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