It seems they were speaking of differences between the EV 2014 2015 and 2016, not ICE versus EV models

Adding charge will definitely mess it up

In my experience it accounts for both just fine.
As I regen both the % AND the kWh go back

Used Corroseal with great success.

Given the wide range of miles, do you have the corresponding period for each.
This may help us weight miles versus time as impact on degradation.

The maths work out to 6.5 mi/kWh. That is quite conservative driving, Good for her! Just keep in mind as was mentioned before that she will be doing quite a lot of miles per year (38,000 from your commute numbers), and you will loose capacity overtime. I have been loosing 0.15 kWh per 1000miles or ...

The loss of capacity on our 2014 is a straight downward line that shows no sign of slowing down. Over the last two years, it has been declining 0.15 kWh per 1,000 miles going from 15.8 kWh at 52,000 miles, down to 13.7 kWh at 66,000 miles. If I assume a nominal usable capacity of 19 kWh that means t...

In reading this topic, I saw that the 2014 Spark EV had a 22kw A123 battery and the 2014's warranty calls for warranty coverage at 65%. That would suggest that warranty replacement could occur when the A123 battery degraded to 14.3 KW within eight years and 100,000 miles. First the 2014 Spark total...

Use google map.
Map the direction, then select the bike route, that will show you the elevation at start and end

In any case, you have the car, So you can just start by using it, and if it becomes too complicated and or stressful, you can face the need for a new car then