I finally picked up mine on Wednesday evening and love it! So far its lifetime average is "250+ mpg", since I've done about 120 miles on it and used 0.05 gallons (yes, really). I even managed to get back from the dealer in Leicester to home near Coventry purely on electric charge, with 1 mile remaining!
Everyone I take in it is blown away by the serene way in which it drives, yet with instantly accessible acceleration when required. I haven't quite squeezed into the 40 mile club yet as everything's been at either 60mph, or my 5 mile route to work which uses 9 miles of range because of climate control and battery temperature management.
I haven't figured out how to get the pre-warming system running to get it to bring the cabin temperature up while still on charge so I can improve that range, but it doesn't work how I expected so I have to read the manual again ;-)