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Well you don't want to accelerate at too far below 2000 rpm since the engine loses too much heat to the cooling system at low speeds, but it's okay if you do that in 2nd gear since you got out of 1st gear early. Anything is better than an unlocked torque converter.
I'm not sure how gear spacing would change the equation. If the gears are spaced out farther then the auto would theoretically lose more energy to the engine needing to slow down more to match the next gear's speed, but effect is probably very small.
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