2015 Chevrolet CruzeChevrolet
2015 Chevrolet CruzeEnlarge Photo
General Motors is the only U.S. carmaker attempting to challenge Volkswagen in the entry-level diesel field, with the 2015 Chevrolet Cruze Diesel.
The Cruze features a 2.0-liter turbocharged four-cylinder engine that produces 151 hp and 264 lb-ft of torque, and drive the front wheels through a six-speed automatic transmission.
EPA-rated fuel economy for the small Chevy is 33 mpg combined (27 mpg city, 46 mpg highway).
The Cruze received a handful of updates for the 2015 model year, but an all-new version is expected for 2016.
2015 Jeep Grand CherokeeJeep
2015 Jeep Grand CherokeeEnlarge Photo
Like the Cruze, the 2015 Jeep Grand Cherokee EcoDiesel is the only offering in its class from a U.S. carmaker.
Behind the Jeep badge is a 3.0-liter turbocharged V-6 borrowed from parent company Fiat. It produces 240 hp and 420 pound-feet of torque.
An eight-speed automatic is the only available transmission, but the Grand Cherokee can be had with either rear-wheel drive or four-wheel drive.
With rear-wheel drive, the Jeep gets an EPA-rated 25 mpg combined (22 mpg city, 30 mpg highway), or 24 mpg combined (21 mpg city, 28 mpg highway) with four-wheel drive.
The Grand Cherokee EcoDiesel is Jeep's sole diesel model at the moment, although have been reports that Chrysler is considering a diesel engine option for the next-generation Wrangler, which likely won't appear before 2017.
2015 Mercedes-Benz E250 BlueTecMercedes-Benz
2015 Mercedes-Benz E250 BlueTecEnlarge Photo
Mercedes currently offers four diesel models, three of which use the same 2.1-liter turbocharged four-cylinder engine and seven-speed automatic transmission.
The 2015 E250 BlueTec sedan features 195 hp and 369 lb-ft of torque, and a choice of rear-wheel drive or all-wheel drive.
Rear-wheel drive models are rated at 33 mpg combined (28 mpg city, 42 mpg highway), while all-wheel drive models are rated at 31 mpg combined (27 mpg city, 38 mpg highway).
The GLK250 BlueTec ML250 BlueTec SUVs both get a slight power bump to 200 hp, with mandatory all-wheel drive. They're rated at 28 mpg combined (24 mpg city, 33 mpg highway) and 25 mpg combined (22 mpg city, 29 mpg highway) respectively.
The larger GL350 BlueTec uses a 3.0-liter turbocharged V-6, with 240 hp and 455 lb-ft. As with the other SUV models, a seven-speed automatic and all-wheel drive are required.
Mercedes' biggest diesel model nets 22 mpg combined 19 mpg city, 26 mpg highway).
2015 Ram 1500 EcoDiesel HFERam
2015 Ram 1500 EcoDiesel HFEEnlarge Photo
The 2015 Ram 1500 EcoDiesel is the only diesel half-ton pickup truck on sale, and the most fuel-efficient half-ton as well.
Its 3.0-liter turbocharged V-6 is shared with the Jeep Grand Cherokee EcoDiesel, producing the same 240 hp and 420 pound-feet of torque.
An eight-speed automatic transmission is mandatory, with a choice of either rear-wheel drive or four-wheel drive.
The standard EcoDiesel gets 23 mpg combined (20 mpg city, 28 mpg highway) with rear-wheel drive, and loses 1 mpg in each category with four-wheel drive.
For 2015, Ram also added an HFE (for High Fuel Efficiency) model to the lineup. Available only with rear-wheel drive, its more aerodynamic body boost fuel economy to 24 mpg combined (21 mpg city, 29 mpg highway).