Can anyone tell me the approx. RPMs for a '92 JDM b16a runnin' at 70mph? The other day, I was hitting 5250 at 70mph which I thought was a little high. Today, I'm around 4000 at 70mph. Is there a chart of some sort for this? CEL light came on around the same time that I noticed the high rev.

Also, I should mention that the CEL came on after a hard stoplight run with a newer Civic Si (smoked him even with a f'd 1st to 2nd shift). The ECU gave me a code 2 (O2 sensor). Today, with the RPMs running lower, the CEL went away.?!

I'm running on 17's and I think this will make a slight difference too for the speed/RPM ratio.