(Portland, OR)  --  The price of gas in Oregon continued to decline last week, while prices nationally increased.  The Triple-A reports Oregon's average declined two cents to 3-60 a gallon.  The national average increased two cents to 3-15.  This is typically the time of year when prices are lowest.  Increasing demand during the spring and the switch to more expensive summer blends of fuel will cause prices to slowly rise.  A wider conflict in the Middle East, or a disruption from winter weather, could cause prices to rise faster.