Today, SOC was 79% before I left home. After I drove 46km, the SOC dropped to 43%. If we assume the usable capacity is 21kWh, 7.56kW was used. The average would be 6.08km/kWh (3.75 miles/kWh). However, the car's dash shows an average of 7.8km/kWh (4.8 miles/kWh). Why is there such big discrepancy? It's off by over 25%. 7.8km/kWh seems to make sense as it was city driving with top speed around 60km/hr (37mph). GOM projection is close to 7.3km/kWh (4.56 miles/kWh).
It's hard to determine the estimated if there isn't a reading I can trust.