Ive done nearly a 1000 miles and it goes in for its service on monday, so far its been superb and its getting decent ecconomy without trying, performance is identical to being on Petrol. I had the filler behind the flap too, no issues with using an adapter.
Only niggle I have is the gauge, 4 green LEDS... the first one goes out pretty much when it should milage wise, the middle two go out in a very short space of time, then the last one lasts a verrrrry long time, I wonder if they can adjust it?
did you notice even better economy after the first service? if they altered the map/injectors?
filled up today at 69.9 :D