 He says finding more customers for natural gas will also help grow the number of wells and increase the state's economy. The average price of a gallon of gasoline in North Dakota went up 4 cents in the past week. That's according to GasBuddy.com. They say the average price is at $3.35 a gallon. That's more than 15 cents higher than a month ago, but 8 cents lower than a year ago.