Just to add a data point in a climate that is not Arizona, the PNW, or coastal California, I have a 2015S which I'm assuming has a lizard pack. Sorry if this is wordy but I want to try and be thorough. I bought it new just before Thanksgiving 2015. Judging from the manufacture date it had likely sat on the lot for 9+ months before I bought it. I am in the Virginia Beach/Norfolk VA area which is about 150 miles southeast of DC as the crow flies (for folks out west not familiar with the area). We have a similar climate to DC but slightly more moderate due to our proximity to the ocean. All indications from the dealer were that it sat in the sun, fully charged for that time in a non-covered spot on a blacktop parking lot. The daytime highs are above 80 degrees here pretty much June - September.
When i purchased the car it had been testdriven about 10 times and had 22 miles on it. Leafspy told me the had 98% SOH and ~62ahr. Seemed reasonable compared to what I had read on the forum given that the car had sat for almost a year. Having now driven ~6500 miles, L2 charged about 200 times, and QC'd about 35 times in the last 5 months it now shows 100% SOH and ~63aHr.
I charge to 100% daily during work week using a timer to get super off-peak rates after a ~55 mile round trip commute, and usually do not need to charge on the weekend as we stay close to the house. I use the heat and AC when needed and I keep up with traffic on the interstate which means somewhere between 60 and 75 mph (most of it closer to 60) depending on traffic and if I get in the HOV. I do drive pretty smoothly, coasting a lot and using regen to do a lot of braking before a stop but I am not actively hypermiling or anything like that. My dash display says I average 4.2 miles/kWh.
I usually get home from work with 20% - 30% of my battery capacity remaining on the dash depending on HVAC use, how fast I drive, and ambient temperature. The rare times that I discharge the battery below 10% remaining, I usually get to about 80 miles on that charge. Miles / percentage used is definitely non-linear. I usually drive about 6 miles to go from 100% to 90% in the morning, but recently drove 26 miles (all interstate 55mph) to go from 29% to 5% when I pushed it a bit in order to get to a QC station and went over 90 miles on that charge despite mostly interstate driving.
I don't have gid numbers because I haven't purchased leafspy pro yet but based on SOH and real-world range at this point I am very happy with the battery performance of the car. It is as good, if not better, than expected. We'll see soon how the hot weather + daily use impacts it since it just sat on the lot all last summer this will be it's first summer of regular driving.