Some Triad gas stations might be running on E, but that doesn't mean you can use the gas shortage as an excuse to miss work.
This gas shortage is just like a weather event. The state's department of labor says your job can require workers to be at work, as scheduled, as a condition of employment and falls under the concept of employment at will.
That means a boss can treat employees as he or she sees fit. At anytime, your boss can fire or hire workers, whether there's a reason or not.