How long is normal for Boxster to sit & battery still work?

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Originally Posted by Giller

Curious....why would locking the car use less power than leaving it unlocked? Locking it activates the alarm, which causes drain. Unlocked....what's draining then? I always leave my car unlocked in the garage to save the battery from the alarm and constant flashing alarm light.

A good question. I don't remember the "why" but only that several Porsche factory guys have suggested this. Perhaps the DME goes fully to sleep when locked. Easy enough to test if you can connect an ammeter and measure current draw before and after locking. Running long leads out from under the hood should work.