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Another thought....

Some cars have "Automatic" driving light and headlight sensors. These sensors are a photo-voltemic electric eye that consumes a little bit more power than you would imagine. If the headlight switch is in the A or Automatic mode then, you could get substantial power draw during the evening. Usually the sensor is on the dashboard near the window.

If this car has one, you may want to put a dark rag over the sensor (to simulate nightime) and see if the power draw increases.

Sadly, I learned this factoid, when on a business trip, I left the setting in Auto on the Lexus and came back after 2 weeks to a dead battery. The owner's manual suggests turning this switch from Auto to Off if leaving the car for a long time....

Hard lesson learned...

If the car does not have one of these... Then forget Bout It.