Gas prices continue to decline; down two cents over the last week.  Oregon’s average is $3.67 and in Washington it's $3.70 a gallon.  Triple-A's Marie Dodds says now that refineries have converted to summer blends of production; the supplies of gas and diesel are increasing and that should cause prices to continue to slowly decline.   Diesel was down 2¢ to an even $4.00 a gallon.