I saw your post and i figured i would let you know that in the 3 forums, there is a method to get four different things to display from your internal computer. It worked for me and i now have current and average MPG, miles left on tank, and average speed. I will paste the instructions but i'm not sure if it will work on the 6's. Might as well give it a try.
- Before you start the engine, hold the CD and AM/FM buttons.
- Start the engine (keep holding the CD and AM/FM buttons).
- After a few seconds, you should see the display read "DIS ON" (driver information system)
- Stop the engine.
- Start the engine again.
- Touch the SET button to see the trip computer.
- Touch the TIME button to see the time.