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Heat stays on after using card key?

I went into the remote backcountry and parked my MY at the trailhead for 3 days. It had 146 miles on the battery. It was 15 degrees Fahrenheit.
No cell service for miles. I put my phone in airplane mode. The MY locked, of course. I needed to get one more thing out of the car so I used the card key to open the door briefly. I closed the door.
When I got back after 3 days, the car had 90 miles on the battery of which 30 was unavailable because of cold.
So, I lost 56 miles over the 3 days !?! Did the car heat for hours because I used the card key? Was it waiting for me to go into drive mode?
 
I went into the remote backcountry and parked my MY at the trailhead for 3 days. It had 146 miles on the battery. It was 15 degrees Fahrenheit.
No cell service for miles. I put my phone in airplane mode. The MY locked, of course. I needed to get one more thing out of the car so I used the card key to open the door briefly. I closed the door.
When I got back after 3 days, the car had 90 miles on the battery of which 30 was unavailable because of cold.
So, I lost 56 miles over the 3 days !?! Did the car heat for hours because I used the card key? Was it waiting for me to go into drive mode?

just throwing it out there... did you leave Sentry mode on?
 

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