RPM curiosity

A topic from a couple days ago made me curious as to what everyone elses RPM's where in different gears. My thinking is this should give us an idea (for those of us who don't know)of what our gear ratio's are OR how off our speedometers are which is a whole different question; DOES everyone feel their speedometers are correct?

My gauges read: 3600 @ 70 mph RPM's in 4th gear and 3200 @ 75mph RPM's in 5th gear. I haven't checked the other gears yet.

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Zach
77 911S 3.2