Here are two plots with ca 45 data points each. For this purpose, the distinction between start and end SoC (wrt a drive) is unnecessary but I had them in different columns so.... The 0-100% battery range, if you solve those linear equations, is 80kWh. That's less than the usable capacity because when it shows 0% is has ca. 2kWh left, and at 100% there's also a bit of a buffer. I think this is probably what most people should see.