Tennessee Drivers Enjoyed The Lowest Labor Day Gas Prices In Three Years, Averaging $2.91 Per Gallon. The Current State Average Is $2.90, Down 52 Cents From Last Year. AAA Spokeswoman Megan Cooper Expects A Slump In Gas Demand As Summer Ends, But Warns Hurricane Threats Could Impact Prices. Despite Lower Prices, Gas Demand Rose Nationally Last Week.