Question about non OD 833 and rpm range

KosmicKuda said
FWIW.
I cruise the 320 miles to Carlisle and just tell myself, while trying not to shift again, that millions of miles were put on these cars at the same RPM.

We used to drive 100 miles to the strip at 3500+, 55 miles per hour stop for fuel then race, fuel up and drive home.
Those were the good old days!