Last sensible figures I have for my 3.2 (since LPG, the petrol stats are rubbish, as only gets a slap and dash every 2 or 3 k) is 27ppm 

GID currently reading 26.9mpg, but that includes country road blast back from WIM.
Given my 90% motor miles, reckon I could get more 
Good god, I clearly need some lessons in "How to drive like tunnie" - I get 21-22mpg around town, the best I ever had on a motorway run for a full tank @ 70mph was 28mpg, with the cruise on and no roadworks! I can't imagine how you get 27mpg on anything other than a steady run :-/
His driving is a sight to behold... ...as long as you're not stuck behind him 
Ohh sod off, I was doing 80mph down the twisties from Buckingham!
Precisely

Coming back from Wycombe last Saturday night (errr, early Sunday morning

), I came via Buckingham (45mins door to door

). A BMW Mini was pissing me off, booting it on every straight. Finally got him between Winslow and Padbury - we both lauched on that little hump bridge, he bottled it after landing

.