Okay, I give up...what exactly does the "600" in the race title denote this week? We know it sure as heck isn't 600 miles since they usually only run like 300 laps at Phoenix.
Perhaps since the race is sponsored by Subway, it's for 600 carbs or something.
That race was to be about 600 kilometers, or 375 miles, long. It was extended by seven laps due to green-white-checkered.