Unable to Connect to OnStar Message
If there is limited cellular coverage
or the cellular network has reached
maximum capacity, this message
may come on. Push 
to try the
call again or try again after driving a
few miles into another cellular area.
See also:
Clock
The analog clock is not connected with any other vehicle system and runs by itself.
To adjust the clock, do the following:
1. Locate the adjustment button, near the lower left corner of the clock.
...
Average Fuel Economy or Average Fuel Economy and Instantaneous Fuel Economy
The Average Fuel Economy display shows the approximate average liters per
100 kilometers (L/100 km) or miles per gallon (mpg). This number is calculated
based on the number of L/100 km (mpg) recorde ...
Using Cruise Control on Hills
How well the cruise control works on hills depends on the vehicle speed, the
load, and the steepness of the hills. When going up steep hills, pressing the accelerator
pedal may be necessary to mai ...