 He says Democratic leaders have organized calls to state party leaders. The average price of a gallon of gas in North Dakota dropped 3 cents in the past week. It's now, at average, $3.21 a gallon. GasBuddy.com says that's 14 cents higher than a month ago, but 12 cents lower than a year ago. The lowest price in North Dakota was $3.10 a gallon. The highest price was $4.19 a gallon.