Quote:
Originally Posted by thatguitarguy
I don't know that staying in D at a light necessarily uses more fuel than N. After all, you haven't changed the throttle position, and the engine is turning at a lower RPM.
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Your engine is turning at lower RPM because the transmission is churning fluid around in the torque converter instead of sitting in neutral. Several people on this forum have confirmed with their Scangauge or MPGuino that the engine uses less fuel in neutral.
That said, I wouldn't use shift back and forth unless you know the light is a long one, and never for P&G. The auto in my Ranger had to go back into the shop after being shifted back into Drive during P&G.