I just got back from a short trip and here are the figures roughly (within 50 RPM or so).
55 MPH = 2300 60 MPH = 2500 65 MPH = 2750 70 MPH = 2950Basically, it is one tick on the tach for each 5 MPH increment from 55 through 70, but at 55 it is maybe a needle width above the 2250 tick mark and at 70 it is maybe a needle width below the 3000 tick mark. This is in 5th gear with the manual transmission and I-4 engine.
Matt