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GREEN | 7 out of 10
2014 Mercedes-Benz GLK 350: 19/25 mpg (RWD); 18/25 mpg (AWD)
2014 Mercedes-Benz GLK 250 BlueTEC: 24/33 mpg
the first four-cylinder diesel in a U.S. Mercedes since the 1984 190D.
The 2014 Mercedes-Benz GLK receives much better fuel economy than the models built between 2010-2012.
The GLK 350 with rear-wheel drive is rated at 19 mpg city, 25 mpg highway, while all-wheel-drive models earn 18/25, respectively. Opt for the torquey, fuel-sipping GLK 250 with its turbodiesel four-cylinder and 4MATIC all-wheel drive, and your numbers improve considerably. It's rated at 24 mpg city, 33 mpg highway.
Fuel economy makes big gains with the turbodiesel--but Benz' gas engines aren't bad, either.