Regarding the BYD "AEC" metric it does "not" reflect total energy consumption by the car...like consumption while idling at a stop light, A/C usage while idling, etc. It pretty much only reflects consumption "while in motion." Therefore, you can't use it to accurately determine real world mileage. And I expect BYD is not alone in how AEC is reported. But AEC is still a decent "in the ballpark" metric. See below Google AI question and answer below. ******** *** Question to Google AI: byd accumulated energy consumption include consumption while parked or A/C usage? Google AI answer: BYD's accumulated average energy consumption tracking (shown in kWh/100km on the infotainment screen) primarily calculates power used while the vehicle is in motion, meaning it excludes extended periods of sitting parked with the air conditioning running. How BYD Handles Energy Tracking Driving vs. Stationary: The trip computer calculates average efficiency based strictly on propulsion and active auxiliary loads tied to driving time. A/C and Climate Usage: While running the A/C or sitting in traffic draws instant power from the battery (roughly 1 kWh per hour once the cabin is cool), this stationary auxiliary drain is not accurately rolled into your long-term average kWh/100km metric. Discrepancies: Owners frequently note that overall battery percentage drops while idling or parked with climate control on, but this consumed energy does not inflate the driving average history on the trip meter.
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