Actually, this doesn't answer your question, but answers the poll and provides info maybe someone else can use. I have a 1999 540/6 and my rpm at 60mph wasn't in one of your survey ranges. FWIW, When I'm traveling 60 mph in 6th gear, my engine's turning a lazy 1750 rpm. Maybe that's why I've been averaging 24 mpg in my (80% highway) commuting.
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2006 Honda Odyssey EXL-RES
2006 Honda Accord V6 EX-L Sedan
1999 BMW 540i 6-Speed (Sold to M3UOND on 9/21/06)
1991 Honda Civic Si - Occasional Beater