The U.S. average retail price of regular gasoline decreased 13 cents from last week to $2.51 per gallon on August 31, 2015, 95 cents per gallon less than at the same time last year. The Midwest price showed the largest decline, down 20 cents to $2.47 per gallon. The West Coast price decreased 12 cents per gallon to $3.16 per gallon. The Gulf Coast and East Coast prices were both down nine cents per gallon, to $2.20 per gallon and $2.34 per gallon, respectively. The Rocky Mountain price was down five cents to $2.77 per gallon.