At my latest fill up this morning over 21 months and 31,707 miles my average in all driving is 47.48 with a best tank of 54mpg and a worst of (ahem) 31mpg...
The driving is a mix of motorway, A/B-Roads and town... I don't granny it and I sometimes I make use of all the performance...
I know that if I tried, I could probably do better. In my experience, I think MonkeyHanger is slightly (but only slightly on the optimistic side... If you work on an average of between 45 and 50 mpg over the life of the car I don't think you'll be disappointed...
Mine is Carbon Grey with 18" alloys. I have Dynaudio (recommended) advanced telephone (don't bother)... they come standard now with more than mine did.
It is a good choice in its price bracket, does most things well... for me it just lacks a little sparkle... but I have something else in the garage for that