Degradation of the GT

Hi guys, I’m not a professional when it comes to reading the battery and I don’t have the appropriate possibilities (nix dongle, or OBD, etc.). I can only count a little. So if I drive like with my RS GT (EZ 11/21, about 12 tkm, almost only up to 80% charged, practically NO DC charge) at the last battery filling e.g. 239.8 km, with 21.64 kWh/100 km used, I get a total consumption of 51.9 kWh. If that’s now 70% of the battery (started at 80% SoC and started at 10 km) I think that’s a little meager! Sure, SoC display is not perfect, but should/should the SOO be crash? After all, less than 90% of the initial value. If this is normal, I have to drive Tesla again soon. I had virtually no degradation with similar calculations for my former M3P after 40 tkm – because I had an actual usable 74 kWh imme r still 73 kWh left. A review of the battery at Audi resulted in a hugely detailed result: i.e. have you ever calculated this way? Or have you had other results with other tests? Can you confirm such a high degradation? BG, Martin