As of May 13, gasoline prices in Montana have risen 0.3 cents per gallon in the past week, averaging $2.86 a gallon according to GasBuddy.com. Prices are 17.1 cents per gallon higher than a month ago and are 7.9 cents per gallon higher than a year ago.
The national average has risen 3.8 cents per gallon during the last week and stands 1.1 cents per gallon lower than a year ago.