Chevrolet has just announced the EPA highway rating for the 2018 Equinox diesel, and a nearly 40 mpg rating puts it at the top of the class.

The 1.6L turbo diesel in the Equinox is rated to get 39 mpg highway with front-wheel drive. That makes it the current highway mileage SUV leader, topping the Nissan Rogue Hybrid’s 35 mpg rating and the 34 mpg of the Honda CR-V. Ratings in city driving, and for all-wheel drive models, hasn’t yet been released.

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The new engine produces 137 horsepower and 240 pound-feet of torque. The all-new design uses a variable geometry turbocharger that can reduce lag while improving peak power. It has start/stop technology to improve fuel economy in city driving.

The big highway number gives the Equinox a big range. It can cruise up to 577 miles on a tank of diesel, letting it go from Chicago to Memphis on one tank.

The 2018 Equinox diesel starts at $31,435 including destination and goes on sale this fall.