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UPDATE: It was the battery.
Last weekend, I checked for milimeter voltage drain across various circuits, but could not locate any. So I removed the battery, took it back to the parts store, and let them do a full test.
Although the battery is clearly rated for 700 CCA, I noticed the technician set their testing device for only 600 CCA. (Is that "standard operating prodecure" for battery testing???) I had to insist that they reset the machine to the correct CCA rating for my battery. An hour later, the tester reported that the battery failed, so I received a free replacement one under warranty.
Everything has been functioning normally this week. There have been no cold start problems, and fuel consumption seems normal.
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