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Stock, right at 4k RPM @ 70 in 6th is generally dead on... Mine is...
Is yours varying from 3700 to 4000 RPMs in 6th @ 70mph?
Should read a certain RPM @ a certain MPH...
You keep saying "about" and giving a range. Can't you just go out and set the damn cruise control and once it stabilizes, read off what it says? This should not be such a tough thing to do.