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All of them use a new eight-speed automatic transmission. Seven combinations of engine and drive are available on the 2014 Jeep Grand Cherokee, comprising four engines and 2-wheel- versus 4-wheel-drive. We'd be curious to test the car again over a weekend of pure city and suburban use, to see if those numbers improved. MORE: 20 EcoDiesel Tested At 28 MPG On Highway In our first 10 miles of use, while the engine warmed up during some particularly cold Northeastern winter weather, we saw numbers from 8.3 to 9.8 mpg-though 10 miles is hardly a representative test. So, in common with other diesel crossovers we've tested, the Grand Cherokee EcoDiesel seems to do better than its ratingsin highway-heavy usage. It's also fitted to the 20 EcoDiesel full-size pickup truck. The diesel Grand Cherokee uses a 240-horsepower 3.0-liter V-6 turbodiesel that puts out a substantial 420 lb-ft of torque. We got an indicated fuel economy of 27.4 miles per gallon over our 253 miles of testing, against an EPA rating of 24 mpg combined (21 mpg city, 28 mpg highway) for our model of Jeep's first diesel in several years, fitted with QuadraTrac II 4-wheel drive.

2014 Jeep Grand Cherokee EcoDiesel, New York City, Jan 2014