I have a suspicion that there is hidden capacity that is slowly used more and more, as the pack degrades giving us all an apparent illusion that there is no degradation during the first several months.
My 2014 manufactured and bought in Jan 14 stayed above 270 Gids for over 10k miles and 8 months and then decreased over the two summers to now at 235. I was delighted to see only marginal degradation during the first summer, only to be disappointed seeing a rapid decrease on the GIDs during the 2ndsummer (this summer) which was almost identical to the rate of degradation seen in my earlier 2011 model.
So the net effect is very little to no degradation the first year, followed by rapid degradation the subsequent years. I am now at 35k miles and 22 months into ownership with 235 Gids and lost one bar, although I think I should have lost 2 bars. At this rate I will lose by 4th bar only around 65-70K miles just enough to put me over the edge of not getting a free battery replacement.
Assuming this is what Nissan is doing for 2014 models by having a hidden reserve to put the owners just over the warranty period, that is quite a deceptive behavior.
The reason why i am stating this on a 2015 thread is that, we need to temper our enthusiasm and excitement over the initial reports from TickTock and others, and wait till we actually go through 3 or more summers to see how the 2015 battery pack holds up. I will reserve my judgement until then.