The Tennessee gas price average continues to rise, increasing five cents over last week. The average is now $2.28 which is 10 cents more than one month ago and nearly eight cents more than one year ago. Tennessee is presently the 9th least expensive market in the nation. Since last week, the national average for a gallon of regular gasoline has increased by four cents to $2.51, which is five cents more than a week ago, nearly 13 cents more than a month ago, and nearly seven cents more than a year ago.