Thanks for the replies, all; I'll check out the big fuel consumption thread.
Yes, I'm measuring only my motorway commute at the moment; I am indeed getting about 33mpg but that's just me in the motor and driving well under 2k rpm with a light foot and between 50-56mph. I reckon the V6 might be more economical than the 2.4 driven like that as it's barely being revved.
So Beverley to Leeds and back is about £20 in fuel which isn't that bad, and it's a lovely relaxed experienced sat up so high and in those comfy Alphard seats. Am certainly getting the 'smiles per gallon' that Dave mentioned!