It's nice to come across someone else who's gone for the Greenline. I've only seen one other on the road and that was in Crewe.
I can only go off the Maxidot for an idea of fuel consumption as SWMBO is the one who puts the "petrol" in - it comes out of a pump at a petrol station therefore it's petrol! Fortunately, she hasn't yet tried to*put* petrol in
At just under 10.000 miles the Maxidot is showing an average of 56 mpg going up to 65 mpg at a steady 60mph on motorways which in real terms should be around 50 to 60 mpg. I don't know if this will improve with more mileage on the clock.
What specification is yours? If I could do-it-all-again I would go for the Elegance if only to get rid of the stupid rear view mirror which on the SE is far too low. I'm only 5ft 7ins but quite often find myself ducking my head to look under it. The auto-dimming mirror on the Elegance is in a far more sensible position but, the Wife don't like leather or faux leather seats so it had to be the SE.
Anyway, rant over! Welcome to the forum and enjoy your Greenline.
Regards, Lee.