Average gasoline prices in Montana have risen 34.2 cents per gallon in the last week, averaging $3.12/g on Monday, March 9, according to GasBuddy’s survey of 615 stations in Montana. Prices in Montana are 40.1 cents per gallon higher than a month ago and stand 2.6 cents per gallon lower than a year ago. The national average price of diesel has increased 85.9 cents compared to a week ago and stands