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jwest....from my standpoint you just have less control of the vehicle when it's hurtling down a hill in N. Generic statement. ....for all the trouble of having to shift out of D and then find a suitable time/place to put it back in, you save 4 mpg for an entire ~10 seconds.
Hence my blanket statement of it being not smart. I don't disagree with the independent facts that you state....I just think at the end of the day it's not something I'd do or advise doing just because of the hassle.