When the Ford 6.7 engine came out you could get more information in the message center. I don't know if this still works, but give it a try and report back.
For those with the full message center - hold down the "down arrow" button on the left hand steering control and turn on your truck.
For those without the full message center - hold down the reset button and turn on your truck.
After a few seconds, the truck will enter engineering test mode which is really just a bunch of hidden info screens you can scroll through - there aren't any settings here you can affect.
Some of the data reported:
- gauge sweep test
- led light test
- rom checksum test (useful for tuners)
- rom and epprom levels
- any continous DTC's
- fuel level remaining (gallons and percent)
- mileage and DTE
- engine RPM
- vehicle speed
- battery voltage
- coolant temp
- a/d converter values
- lcd screen test