
Using the GOM to estimate battery capacity is not the best method. But certainly the easiest.
I really should do proper range testing. That is something I want to do when the weather is warmer. (about 20C).
For now I'm just watching to see how far it goes over the next 3 or 4 days until I need to charge it again.
After 3 days use I have driven 105km, the SOC shows 50%, and the GOM shows 96km left.
My blue Soul EV just charged to 158km on a full battery.
In the last few days the climate, driving style, places driven are all roughly the same as the white car.
The blue Soul EV has an estimated SOH of 94%. Implying it has 25.38kWh of usable capacity left.
In charging from 13% to 100% I added 23.8kWh. This implies a 100% charge would take 27.25kWh.
The numbers do not seem reliable.
I think I can show why the energy required to charge a degraded battery is no longer easily calculated.
But I do not know why comparing the GOM figures on these two cars is so unreliable.
Anyway if I did use the comparison of the two GOM numbers.
The ratio of the battery capacities would be 197 / 158
If the blue Soul EV has 25.38kWh of usable capacity left, then the white soul EV has 31.65kWh.
This seems too large. A 2018 Soul EV has 30.0 kWh of usable capacity. It has 100 of the E400 cellpairs.
If all the buffers were the same this would imply a replacement battery is 96/100 * 30 = 28.8kWh
This was my guess 1 above, which I rejected because the reported GOM figure seems higher than if this were the case.

Looking at the charging data from Torque.
Both cars drew 28.7Amps from the wall at 215V.
The Blue Soul EV took 3.85 hours to charge from 13% to 100%. The energy going into the OBC = 23.6kWh
The White Soul EV took 5.1 hours to charge from 9.5% to 100%. The energy going into the OBC = 31.6kWh
The energy going into the battery must always be less than the energy coming from the wall.
Above is an instant value. For the calculations I use averages from the entire charging session.
For the The Blue Soul EV the overall energy efficiency was about 85%, hence the energy actually going into the battery = 20.0kWh
This is a much better number than the previous calculation. (It cannot be 23.8kWh  that number is greater than the amount pulled from the wall.)
The values in the Cumulative Energy Counter are not to be trusted in a degraded battery.The EWP cooling system came on after about 90minutes in both cars and stayed on.

Repeating the calculation I did earlier but this time with a much lower value for the battery capacity of the older car.
The blue Soul EV has an estimated SOH of 94%. Implying it has 25.38kWh of usable capacity left.
But in charging from 13% to 100% I only added 20.0kWh. This implies a 100% charge would take 22.99kWh.
Also It seems that the range loss in winter for a degraded battery is more than the deterioration numbers suggest. A new battery suffers less at cooler temps. I'll have to wait a few months to see if the range on the blue car comes back faster than for the white car. That's my best guess at the moment.
So if I did use the comparison of the two GOM numbers.
The ratio of the battery capacities would be 197 / 158
If the blue Soul EV has 22.99kWh of usable capacity left, then the white soul EV has 28.66kWh
Again this value is close to my guess 1 above
The codes for using Torque Pro can be found by clicking the link in the website icon under my user name on the left.