(Portland, OR) -- Gas prices are trending down across the country and Oregon's prices may have peaked for the spring. Triple-A reports the national average price for a gallon of gas declined seven cents to three-53 a gallon and Oregon's average fell half-a-cent to four-11. It's too soon to tell whether Oregon's prices will continue to decline. Lower crude oil prices and lower demand have helped bring prices down. Diesel in Oregon fell a nickel last week to four-50 a gallon.