For me:
To work and back (old job): 14-16mpg
To work and back (new job): 18mpg
General pottering around: 24-25mpg ish
On a good run (with car loaded with people): 32mpg ish
On a good run (car empty): 27-28mpg ish.
Mainly motorways with caravan: 22mpg
All with the 3.0 Auto.
eh?
I take its steady when I've got passengers!
On my own, well... I need to check that I've got 200+ horses pulling me along every now and then
All boils down to driving style...
I remember when I had a 1.8 Vectra, I Managed to get from one side of York to the other via town centre (at 11pm ish, so avoiding drunks etc) Hit every traffic light at red, and still got 42mpg.
Not easy to achieve though – You basically can’t use the brakes, and use the throttle very lightly. Plan ahead as far as you can see almost, and when slowing down, use engine braking so the fuel injectors turn off, that said don’t start engine braking to early, or you will need to accelerate again, like wise, don’t start engine braking too late because you loose valuable time when the engine could be in over run (injectors turned off)! Also, remember that while engine braking, there’s no brake lights! Always keep the car rolling if possible.