I have a M3 LR AWD. I am going to be going to Rio to visit my wife’s family for Christmas and would need to leave the car at the airport for 3 weeks. I see lots of comments about battery drain, parasitic loads, etc. I know to shut off Sentry mode, but beyond this, I still see 12-15 miles/day loss. The environment will be an airport parking garage, temps averaging 25 to 45 F. What else can I shutdown and how?