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.
READ THIS: 2017 Kia Niro: gas mileage review. We haven't yet tested the Kia Optima Plug-In Hybrid that's now on limited sale in certain states, but the conventional hybrid Optima is a worthy competitor to hybrid versions of the competing Chevrolet Malibu, Ford Fusion, Hyundai Sonata, and Toyota Camry.