Just to update SD4 2.2 9spd Dynamic auto MY2015:
4089 miles, average 35.21 best tank fill= 38.27, worst= 31.74 9early one) more than half miles are on dual carriageway/motorway but not more than 80mph (only for safe overtaking, of-course!).
OBC is still consistently 2 to 3 mpg optimistic.
Same for me Spiderman - checked IC Remote app when got home + at least my edited log of journey info etc was still showing. Plus, I do a written log of fuel, mileage, mpg each time fill up so all not lost!
.. all my previous journeys were all there but I didn't log into the app for a couple of days after they disconnected me and when I did nothing was logged for the couple of days that I hadn't logged in so lost 2 days....