I've quit using neutral at red lights in my automatic. I've decided that the miniscule amount of wear to the 1st gear clutch isn't worth the miniscule gas savings I get.
Your friend's Maxima will need a well-calibrated Scangauge or a fuel injector duty cycle meter (see the DIY fuel rate meter link in my sig) to tell if it's using more fuel at higher RPM in neutral or higher load in D.
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This sig may return, some day.
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