Also note that the "C" & "G" concourses have moving walkways and the
connector between the two.
Also "C" has a two car tram that transits from the junction of the "A"-"B"
concourses with 2 stops to the junction with the "D" concourse.
If the tram is available take it - it is much faster than the moving walkways
especially if connecting to the "D" - "E" (other airlines) - "F" and gates 1-6
on the "G" concourse. If the tram is not available for immediate use then
use the moving walkways.
Results of a time versus distance study when I had time to waste.
Not a perfect science but like 'Clint' said "A man had know his limitations" !