Missoula, MT (KGVO-AM News) - Montana gas prices have slightly dropped after back-to-back weeks of significant increases. “Average gasoline prices in Montana have fallen 2.8 cents per gallon in the last week, averaging $4.27 per gallon today,” De Haan said. “Prices in Montana are 35.2 cents per gallon higher than a month ago and stand $1.04 per gallon higher than a year ago." “The national average is up 28.5 cents per gallon from a month ago and stands 93.6 cents per gallon higher than a year ago. The national average price of diesel has increased 7.1 cents compared to a week ago and stands at $5.33 per gallon.”