As of May 20, gasoline prices in Montana are unchanged, averaging $2.86 a gallon according to GasBuddy.com. Prices are 7.0 cents per gallon higher than a month ago and are 1cents per gallon higher than a year ago.
The national average has fallen 2.1 cents per gallon during the last week and stands 8.1 cents per gallon lower than a year ago.