(Portland, OR) -- Gas prices continue to fall fast. Triple-A reports Oregon's average declined 24 cents over the last week to $5.05 a gallon. It's the third largest decline in the nation. Prices in Alaska fell 36 cents and in California they dropped 29 cents. Oregon is one of five states with prices still above five dollars a gallon. Lower crude oil prices and fewer drivers filling up are keeping prices down, now that refineries have completed their fall maintenance.