(Portland, OR) -- Gas prices continue to rise in Oregon and across the country. Triple-A reports the cut in oil production by OPEC+ along with increased demand for gas and a decline in supply caused gas prices to go up. Oregon's average increased six cents to three-99 a gallon while the national average increased a dime to three-61. Portland and Medford have some of the highest averages in the state at four-oh-eight a gallon. Diesel in Oregon declined two cents to four-61.