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Phantom drain...

I usually lose about 3 miles a day, as long as I have the car sleep, 'stay connected' is off, and I don't check on the car with the smartphone app. Otherwise, usage will go up a bit. It can also vary a bit based on ambient temperature or the cycling of your pack on to top off the 12V auxiliary battery.

So you're in the ballpark, but probably a little higher than typical loss--perhaps due to one of my listed reasons.
 
While I was away for 5 weeks, my iPhone app kept getting regular notifications every 3 days reporting on a charge of 9-10 miles back to the original charge end point. That works out to about 3-4 miles vampire loss a day and apparently within normal limits. The loss from the dashcam would be in addition to the normal vampire loss from the car's basic electronics.
 

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