All 2008 Kia Rio models are powered by a 110-horsepower, 1.6L four-cylinder engine, matched with either a five-speed manual of four-speed automatic transmission, and all are front-wheel drive. With the five-speed manual, the Rio returns 32 mpg city, 35 mpg highway in the EPA cycle. The fun-to-drive aspects are emphasized in the Rio's economical design. The engine has continuously variable valve timing for responsiveness, while the power steering is engine-speed-sensitive. The suspension is tuned for a smooth ride yet crisp control, with MacPherson struts and a stabilizer bar in front combined with a semi-independent setup in back. The Rio has more interior space than most cars its size and also has a generous 11.9 cubic feet of cargo space in the sedan, 15.8 cubic feet for the Rio5. When the Rio5's split-folding back seat is in the forward flat position, cargo space is expanded to nearly 50 cubic feet. Inside, all models have an eight-way adjustable driver's seat with fold-down armrest, a versatile center-stack storage tray, and rear mesh seatback pockets. A full set of side air bags--front seat-mounted side air bags and full-length side-curtain bags--are both standard, however electronic stability control is not available, and anti-lock brakes are optional on LX and SX models but not available on the base model. The Rio is now available in three different trims--a price-oriented base model, the LX, which includes many popular 'must have' features, and the sportier SX, which adds a sporty appearance and feel along with some extra conveniences. All models, including the base, come with a rear defroster and dual 12-volt power outlets. LX models add air conditioning, tilt steering, a CD sound system with audio input jack, plus adjustable rear headrests and split-folding rear seats. SX models add a dash of style with red-stitched gray sport seats and door trim, metal accents for the dash and doors, and a leather trimmed steering wheel and shift knob.