Average Gas Price In OR Up Six Cents (Portland, OR) -- The average price of gas in Oregon is up six-cents a gallon over the last week, which is the largest increase in the country. The triple-A reports Oregon's average is three-dollars-and-83-cents-a-gallon. A refinery fire in Texas and distribution problems due to weather in the Pacific Northwest caused prices to increase. Oregon's average is fifth highest in the country. Washington State is third with an average price of three-dollars-and-89-cents.  Bend's average price for a gallon of regular is $3.91.