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5k RPM's at 65mph

I was checking the RPM's tonight at 65mph in 5th gear, and found them to be
2,540, significant to three digits.  Tried it several different times over
a 200 mile trip. That's in a 1987 5kcstq, bone stock including tire size.

My observations tend to substantiate what Brendan is saying:   

>Depends on the 5k.  My 5k definitely does _not_ do 80mph at 3000rpm.
>Closer to 65mph, and 4000rpm at 80mph, similar to your figures for the 4k.
>My 5k (an '87 S model quattro) has the lower gear ratios.  I don't know
>personally what determined which gear ratios were used in which 5ks.