Gas Prices Fall Again - ABC News Gas prices are working their way down again. The weekly average price of a gallon of regular gas is $3.82, down 3 cents compared to a week ago, according to the Department of Energy. This price is still up 34 cents from this time a year ago. The West Coast is working through supply issues, so prices there are also down nearly 2 cents compared to a week ago. The West Coast has the most expensive gas in the country, with an average price of $4.39 a gallon. The Gulf Coast has the least expensive gas in the country at $3.54 a gallon.