a few hundred feet at a time adds up. I wouldn't do it, Automatic transmissions are too costly to replace and refurbish to risk it. There is no way to save that much money in P&G or engine off coasting to risk any damage to the tranny. Remember, in most areas a automatic transmission replacement will run over 3500 USD.
It is all done based on someone's personal desire for risk vs. reward. I know that a transmission requires the pump to help cool and lubricate a transmission, especially after it is warmed up. I have a automatic and I will throw it into N for my coasts.
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