Fuel Economy Est-Combined (N/A): 25, EPA Fuel Economy Est - City (MPG): 22, EPA Fuel Economy Est - Hwy (MPG): 32, Fuel Tank Capacity, Approx (gal): 17.7, EPA Greenhouse Gas Score: 7, Engine Type: Gas I4, Displacement: 2.4L/144, Fuel System: MPI, SAE Net Horsepower @ RPM: 175 @ 6000, SAE Net Torque @ RPM: 168 @ 4000, , The 2009 Hyundai Sonata delivers full-size, family-style room and comfort with 30 mpg highway fuel economy. , Sonata is big inside, with so much interior volume it the EPA classifies it as a large car. It's roomier in almost every dimension than most of its mid-size competitors, many of which are larger outside, and it offers a full-size edge in creature comfort., The Hyundai Sonata continues to refine its signature design cues, the sculptors looking in the right places without offending conservatism.