Budgeting for your spring break getaway? Gas prices in Oregon and Washington aren't expected to change much. 38 states, including Oregon that are playing less last week than they were a year ago. Marie Dodd’s with the Triple A says Oregon's average price for gas is $3.78, about two cents lower than last week, but 10 cents higher than the national average. Diesel prices are down a couple pennies, too at $4.10 per gallon in Oregon. The nationwide average at $4.06.