Huh, re-reading your OP, it does sound like a FMM. I've never experienced that since I always use a little gas every day. You can interpret your post in both an alarming tone and a "oh yeah, that's FMM doing it's thing" tone. Thank you for updating with the final prognosis! Sure educated me. I'll have to remember this if I ever get a shorter commute and skip the petrol habit.Update!
I got my car back from the dealer's service department today and feel a bit sheepish. Evidently, my display glitches were due to the car going into the Fuel Maintenance Mode. I guess I should have seen the notice on the center display, but I did not. Since I took delivery last June 29th, I wasn't expecting the FMM for three months or so. However, the car was built in March 2016, so maybe it goes by build-date. The only question I have is , does anyone know if the EV Range light goes out during the FMM. Mine does after a minute or so from start, and that was the first thing I noticed.
I put the car in "Hold Mode" and ran my errands today expending my first gas except for a few EMM's, and hoping this will speed this process. I drove 49.6 miles and burned only .89 gallons. This is going to take a while, as I'm still showing a full tank.
BTW, it wasn't a total loss - there's a new software upgrade that just came out, and I got that done.