Calculated SOC for BMW iX is way off

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Set my vehicle as the BMW iX with accurate SOC at the start of the trip. The calculated battery consumption displayed on the CarPlay app was way off. Within the first 10 mins of driving, ABRP thought I had consumed about 10% whereas my car actually used about 1%. Required me to manually adjust SOC more than 10 times over a 100 mile distance, each time by about +5%