I've noticed this in the van I drive at work (2008 E150 4.6L V8). If I was driving at, say, 45 mph at 1600 rpm and shift into neutral the rpms will stay right at 1600, then slowly fall as the vehicle decelerates. It's like automated rev matching. In my Escort the revs will drop to just slightly higher than idle when shifting into neutral while moving.
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