Missoula, MT (KGVO-AM News) - Average gas prices in Montana have increased in 25 out of 38 weeks. Prices were unchanged last week and took a big drop this week. “Average gasoline prices in Montana have fallen 4.1 cents per gallon in the last week, averaging $3.19 per gallon today,” De Haan said. “The national average is unchanged from a month ago and stands 1.8 cents per gallon lower than a year ago. “Florida, Ohio, Michigan, and Maryland— all states known for routine price cycling— saw double-digit jumps to average gas prices,” said De Haan.