The Hertz Corp. has expanded its Green Traveler Collection fleet to include the 2016 Hyundai Sonata Hybrid in select U.S. cities.

"Hertz is always looking for opportunities to improve and grow our sustainability efforts, as well as provide customers vehicle rental options that are fuel efficient, so we're excited to add the newly redesigned Hyundai Sonata Hybrid to our green fleet," said Tom Frese, senior vice president, Fleet and Procurement.

Rated at 40 mpg city and 44 mpg highway, the Sonata Hybrid switches between a gasoline engine and an electric motor. The vehicle's battery pack has been designed to fit below the trunk floor, giving drivers a flat, unobstructed space for loading.

The Sonata Hybrid is available to rent at several Hertz airport locations including Los Angeles, Orange County, San Francisco, Atlanta and Chicago — as well as cities such as San Jose, San Diego, Portland and Denver, according to Hertz.

The Sonata Hybrid is just one of Hertz's rental choices available in its Green Traveler Collection, a line of hybrid, electric and clean diesel vehicles. All of the Green Traveler cars have fuel ratings starting at 33-plus highway mpg, according to Hertz.