Minnesota gas prices have risen point-8 cents per gallon in the past week, averaging $2.42 a gallon. Prices in Minnesota are point-7 cents per gallon lower than a month ago and 36-point9 cents per gallon higher than a year ago. GasBuddy price reports say the cheapest gas in Minnesota is priced at $2.25 per gallon while the highest is $2.63. Prices in New Ulm range from $2.39 up to $2.44 a gallon.