Just wondering, aside from the alarm system, what are the major elements that still use battery power when the engine is off? Also, does the air shock system maintain a 'running' certain height when the car is off?

Thank you

 

Here's what element I think using battery power after engine is turned off:
-The clock.
-The LED light (When you lock it).
-Interior lights.
-Instrument cluster (Displaying the mileage of your car)
-Things like windows, radio (Because when there's no battery power, you have to retrain your windows, re-enter your radio security code...)
-Certain modules...
-...
Also about the suspension, I'm not so sure about it but I think it might have a "running" certain height.
I hope it help (If it doesn't, well I'm really sorry.)

 

The air suspension is claimed to "wake-up" occasionally, and obviously the door locks etc.

Anyway, the question is "how much current". I have measured 36mA. This is an average over days with the battery already fully charged. The measurement is via the battery charger, so it includes any self-discharge of the battery as well as the car.
(that's about 0.86Ah/day, or 6Ah/week, or 24Ah/month. So don't leave your car longer than your wife)

The air suspension system will not maintain a "running height", but it will attempt to lower the car to keep it "even".

(You have asked this question before. In the meantime, it's not clear what you did or what problem you still have. I previously stated what MY drain is, I think you should measure what YOUR actual drain is before anyone can opine whether the battery drain is excessive or not.)

It is also said in just about every other post that we need a good battery. Whilst I like to dream that a battery will last 5 years or so, if I had (related) problems I would just change the battery. Really cheap given other maintenance.