Two different engines are available on the front-wheel-drive Hyundai Sonata for 2007--a 162-horsepower, 2.4L four-cylinder or a 234-horsepower, 3.3L V6. Both of these engines have all-aluminum construction, continuously variable valve timing (CVVT) for good response at all speeds, and hydraulic engine mounts to help reduce vibration. Four-cylinder models are available with a standard five-speed manual transmission or four-speed automatic, while V6 models are only fitted with a five-speed automatic transmission with a Shiftronic feature good for manually selecting gears when desired. With either engine, the Sonata has very respectable fuel economy for a four-door sedan, with up to 34 mpg on the highway with the four-cylinder and up to 30 with the V6. The Sonata has a roomy interior large enough for five adults, and the rear seat is 60/40-split and folds forward nearly flat. A smooth ride is assured by a four-wheel independent suspension with double wishbones and coil springs in front and a multi-link arrangement in back. Six air bags are standard, including front seat-mounted side-impact air bags and side-curtain bags that cover front and rear outboard occupants. All Sonatas now also have electronic stability control (ESC) and anti-lock four-wheel disc brakes with electronic brakeforce distribution (EBD). And in federal crash tests, the Sonata got the highest five-star results for front and side impacts. The base GLS comes with the four-cylinder, while the better-equipped SE and Limited models come with the V6. The GLS includes keyless entry, air conditioning, cruise control, a tilt steering wheel, outside heated mirrors, and power windows, locks, and mirrors. A Premium Sport package adds alloy wheels and fog lamps. Next up is the SE, which brings more powerful brakes, fog lamps, chrome trim, steering-wheel-mounted audio controls, and solar glass. The top Limited model includes alloy wheels with lower-profile tires, automatic climate control with air quality system, an auto-dimming rear-view mirror, telescopic steering wheel adjustment, and a sliding center armrest. Top options on the SE and Limited include a power sunroof and an upgraded sound system with a six-disc CD changer, MP3 compatibility, and a subwoofer.