(Portland, OR) -- Just in time for the Independence Day Holiday, the average price of gas in Oregon is up eight cents a gallon to four-64. That's still 90 cents a gallon less than this time last year. It's more than a dollar above the national average, giving Oregon the fourth-highest price in the country. Triple-A reports maintenance continues on the Olympic Pipeline, which brings gas from refineries in Washington state to Oregon, and the reduced supply is driving prices higher. Diesel in Oregon increased a penny to four-43 a gallon.