I am always interested in the rpms that an engine turns at typical highway cruising speed (70mph). I'm curious to see what others report...

My '09 Crown Victoria with the 3.27 rear axle ratio turns 2050 at 70mph.
Current fill in Crown Vic: Mobil 1 0W-20 AFE
"In God we trust; all others must bring data"
-Edwards Deming