(Portland, OR) -- Gas continues to get cheaper across the country. Triple-A reports the national average declined a nickel to $3.35 a gallon while Oregon's average also lost five cents to $3.80. The national average is at the lowest level since March and Oregon's average is at its lowest price since February. Oregon's average is 94 cents a gallon less than this time last year. An oversupply of gas, moderate demand and relatively low crude oil prices are causing gas prices to decline.