Appointments & care. At Mayo Clinic, we take the time to listen, to find answers and to provide you the best care. Respiratory syncytial virus (RSV) is a virus that causes infections of the lungs and respiratory tract.
2015 Hyundai Sonata Eco: Gas Mileage Review. The 2015 Hyundai Sonata Eco is the Korean maker's most fuel-efficient mid-size sedan that doesn't use a hybrid powertrain. And it highlights the two parallel paths that automakers are taking as they work to boost gas mileage ratings to meet steadily rising corporate average fuel economy rules.
Under the hood, the Sonata is powered by a standard 185-hp, 2.4-liter 4-cylinder engine mated to a 6-speed automatic transmission. For better fuel efficiency, a 178-hp, twin-turbocharged 1.6-liter 4 cylinder mated to a 7-speed automatic is available for the Sonata Eco.