650-750 in N or D?

Chiltons says 650-750 in D
MB says 800-900 in N

For me 650 in D translates to a 2000-2500RPM cold Idle.
Alternator doesn't charge below 1000RPM.

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RIP: 80 300SD
RIP: 79 450SEL
2002 E430 4matic (212,000km)
2002 ML500 'sport'

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