For an auto, probably keep it in 1. That'll keep the center diff in "locked" mode.
For mud, I've found the Grabbers to be mediocre at best. Still, I haven't yet aired-down, simply for lack of air-up places around the trails and I never remember to bring a compressor with me. I'll start taking it down to 30ish when I install my permanent compressor.
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The Aggressive™ -- You don't know about it.
1998 Forester S - Big brakes, Big Tires, 5-gears.
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