there is no reason to run it to readline because you make more power at less than the redline. When the power graph starts to level out/decrease it's time to upshift to get back into the powerband.

__________________
2006 BMW X5 4.8is Lemans Blue/Beige/Dark Maple
-Nav, Comfort Seats, Heated Steering Wheel,
Rear Airbags, AUX Input
2009 BMW M3 Space Grey/Black/Carbon
-all options