The V-6 powered 2018 Jeep Wrangler improves fuel economy by 11% in combined city and highway driving in part by adapting an eight-speed automatic transmission that replaces a five-speed gear box, according to the U.S. Environmental Protection Agency.

Fiat Chrysler has yet to launch the vehicle or provide details about its powertrain. FCA will unveil it later this month at the Los Angeles Auto Show, yet the EPA has posted fuel economy data about the 2018 Wrangler and four-door Wrangler Unlimited on its fuel economy website.

The Wrangler Unlimited powered by a 3.6-liter V-6 and paired with the eight-speed automatic would return 20 miles per gallon combined, 23 mpg on the highway, and 18 mpg in the city, the EPA reports. That's an improvement of 2 mpg combined, 3 mpg on the highway, and 2 mpg in city driving.

The two-door V-6 2018 Wrangler with a five-speed automatic transmission has been rated to achieve 18/21/17 mpg in combined, highway, and city driving. There would be no change from the 2017 model.

Jeep will continue to offer a six-speed manual transmission with both models that provide slightly lower fuel economy than the other models, according to the EPA. All models have four-wheel-drive powertrains.