Cheap Insurance explored some of the reasons behind major changes in gas prices, and compiled a list of the cheapest gas stations in Portland, Oregon using data from Gas Buddy.

PORTLAND, Ore. (KTVZ) -- Average gasoline prices in Oregon have risen 22.1 cents per gallon in the last week, averaging $4.23/g Monday, according to GasBuddy's survey of 1,307 stations in Oregon.

A stroke of bad luck has sent gas prices in Oregon rocketing 15 cents upward in the past week — to $4.28 per gallon, the second largest price increase in the nation over the last week, according to ...