(Portland, OR) -- The U.S.-Israel war against Iran and seasonal changes in the type of gas used are causing prices to rise significantly. Triple-A reports that the national average increased 43 cents to three-54 a gallon over the last week. Oregon's average increased 31 cents to four-26. Oregon's average was already elevated from a three day shutdown of the Olympic Pipeline, which is back in operation. Summer blends of fuel are now being produced, which are more expensive.