what's the use of "N" in a AT?

[dr. d]

So kung normal stop and go, ok lang na wag na ilagay sa N at D nalang? Sa US kasi, they really don't bother putting it to N unless 5 to 10 minutes ka naka idle.

putting it to N while idling, reduces the wear and tear that would occur should you put it in D.
the wear and tear will be in the engine, the trans box, and the brakes.
there might also be just a wee bit increase in fuel consumption..
the argument of N versus D for CVTs, are just like traditional ATs. see above.

no big deal, really. it's up to you.