Find that 0.1 amps by selectively pulling fuses. A friend's new Subaru will drain the battery in 4-5 days so much that it will not start. The drain was about the same (0.1 amps) on a 50 percent duty cycle for the alarm. It appeared to be a design flaw. Dealer had no answer.

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83 300TD, 260,000 miles, aka "Dusty"
6 vehicles, 2 cup holders (both in the dump truck)