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The modernized off-roader has earned a 23-mpg highway rating.

The redesigned Jeep Wrangler appears to have achieved a modest increase in fuel efficiency.The new Wrangler Unlimited has achieved a city/highway/combined rating of 18/23/20 mpg with Fiat Chrysler Automobiles' 3.6-liter V6 and eight-speed automatic transmission, while the six-speed manual gearbox lands 17/19/23 mpg.

The JK-chassis Wrangler Unlimited is slightly lower at 16/21/18 mpg for the manual six-speed variant, not much higher than the original first-generation's 15/18/16 mpg with a 4.2-liter engine.

The latest EPA data does not shed light on the new 2.0-liter turbocharged four-cylinder engine, which is expected to be the most efficient option. It is also rumored to be rated around 300 horsepower.

The JL will be officially unveiled in Los Angeles.