(Portland, OR) -- Across the country, gas prices are up four cents a gallon to an average of three-dollars and 27 cents but Triple-A reports that Oregon's average is down four cents to three-dollars and 70 cents a gallon. It's the largest weekly drop for a state in the nation. Barring any supply disruptions, has prices in Oregon are expected to continue downward. The national average appears to have bottomed out and Oregon's prices will do the same before they start increasing in the spring. Diesel in Oregon declined two cents to four-77 while the national average fell four cents to 464-dollars.