Not "rev" higher, idle higher.
Idle speed is the speed at which the engine rotates when stopped at a light, not the speed it's at in Park. Thus, the proper way to measure the idle speed of an automatic is by putting it in drive. Doing this places a load on the engine, and the speed comes down. If the idle speed was the same for both an auto and a 5 speed, then when you shifted it into park, the idle would go too high.
Take care,
~Chris
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