Gas Prices Have Hit A Plateau, After An Unseasonable Jump At The Pump. Tennessee Gas Prices Rose An Average Of Eight Cents In 10 Days. Analysts Warn That Oil Prices Could Be Somewhat Volatile This Week. Tennessee Motorists Are Paying On Average $2.33 A Gallon, While Virginia Drivers Are Paying $2.28. Meanwhile, The National Average This Week Stands At $2.56.