(Portland, OR) -- Gas is getting more expensive. Triple-A reports over the last week, the national average price for a gallon of gas increased seven cents to three-68. Oregon's average also increased seven cents to four-06. In Bend, the price of a gallon of regular is up 8¢ to $4.05.  The rising price of crude oil is the main cause of higher gas prices. Crude oil is now in the low 80s per barrel. The price of oil increased after OPEC+ announce a cut in production. California has the most expensive gas at four-92 a gallon and Mississippi has the cheapest gas at three-17 a gallon.