I have done some testing over the Leaf years and used leafspy pro a lot. Have found that under some circumstances the numbers leafsy reports are way off.
I live in Sweden so summer temperatures are around 20 celcius and in winter -5 celcius average.
Example1 tested under year 2016.
2014 Leaf, build late 2013.
When the car was 2,5years old and with 60000km(37500miles) Leafspy showed ~67AHr and 100% SOH, way to good to be true, so i tested the range.
When i drowe this car i could get 120km range with consumption 150Wh/km from 100% to turtle, that gives exactly 18 kWh available energy @ battery temperature 20 Celcius
Example2 tested under 2017
2016 Leaf, build early 2016.
Now when the car is 1,5years old and with 20000km(12500miles) Leafspy shows 59AHr and 89% SOH, way to low to be true.
When i drive this car i get 133,5km range with consumption 150Wh/km from 100% to turtle, which gives 20 kWh available energy, battery temperature 20 Celcius
That shows that leafspy reports ~10% more energy than i can get in example1, and ~10% less energy than i can get in example2.
I think i found out why.
The 2014 Leaf was always driven on highway with high output by me, often with an average consumption of 200Wh/km(3.1miles/kwh)
The 2016 Leaf is driven very gently over the 12500miles by my wife on small roads with very low output, she often averages around 120Wh/km(5,2miles/kwh)
I have also tested how much power these cars draws from the outlet, and it shows the same result, about 10% more power goes in to the 2016 Leaf.