PORTLAND, Ore. (KTVZ) — Average gasoline prices in Oregon have fallen 5.9 cents per gallon in the last week, averaging $3.75/g Monday, according to GasBuddy’s survey of 1,307 stations in Oregon. Prices in Oregon are 15.9 cents per gallon lower than a month ago and stand 96.3 cents per gallon lower than a year ago.