Arrival % is estimated from your start SOC, Wh/km, and the driving polyline. If you then exceed the assumed speed or sit in traffic with AC, you will beat the estimate in the wrong direction. Charge earlier if the dashboard disagrees.
Primary vs backup vs Maps
Primary is the ranked suggestion. Backup is your insurance. Google Maps only knows the waypoints you selected. If you never tapped a backup, Maps cannot save you. Read charger data & accuracy for the honesty policy.
