8 fuel-saving car technologies
Smaller engines in bigger vehicles
Hyundai designed the current Sonata with only room for a four-cylinder engine, making use of the extra space to provide a full-sized sedan interior in a mid-sized vehicle. In the past, the car would have had an optional V-6. Ford's new Explorer soon will offer a four-cylinder turbocharged engine in two-wheel-drive versions, and is sending V-6s to replace V-8s in segments of its truck lineup.
Pictured: The 2.0-liter four-cylinder engine in the Hyundai Sonata Turbo.