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The owners manuals typically list the gear ratios for
all available engine combinations for the year the manual
applies to. You could check it and see if they are the
same.
My S70 with a 5 speed has same engine RPM as my wifes
855 with a 4 speed automatic in high gear. Newer cars
have a 5 speed automatic so maybe the newer automatics
are geared a bit higher (or the tire sizes were slightly
different) then the manual transmissions.
By the way, the engine speeds you listed are very close
to what both of our cars see.
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