When I saw this post last week I was intrigued as to what WattCat reported regarding my battery. A few months ago I posted some observations regarding the capacity of our batteries (
L2 charging, battery performance and longevity - a few...), so I felt that I had a good handle on my battery (down ~7-8%).
After reading this post I checked the optimized value for my battery in WattCat and got a number of 88%. Today after a full charge the optimized % is 100.
I believe this number is based on the efficiency and usage data reported by the car to JLR, so no complaint meant regarding WattCat, but this number appears to be highly variable. I also find the logged journey data to be inconsistent and when summed over a charge cycle to give usage that varies by at least 5% from charge cycle to charge cycle.
Your range of 201miles and the reported capacity of ~75kWh, does seem low, albeit within the parameters that JLR established in the battery warranty. How long have you been seeing these numbers? I find the battery capacity to vary by up to 5kWh depending on the temperature when charging.
A check by the dealer hopefully will clarify the issue, but be aware Li ion batteries do degrade over time, irrespective of use, so an early 2019 might expect to show some degradation.