(Undated) — North Dakota motorists are enjoying a bit of a break as they top off the tank. As reported by Triple-A, the average price for a gallon of regular fell to two-dollars-84-cents. Meanwhile, the national average remains at three-oh-seven a gallon. Oklahoma continues to have the lowest average gas price in the nation at two-dollars-60-cents a gallon. Hawaii is still the highest at four-54 a gallon.