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I am using power mode regularly.
It gives more mpg than other modes.
I am not using accessory mode always and warning is coming when switched to accessory mode instantly.
I changed the 12v battery before about 8 months ago.
After a long trip also this warning message come in accessory mode.
Fulel consumption reduce...
When i switched to accessory mode in prius zvw30 ,it shows warning message with yellow triangle.
After about 5seconds its go off.