You said the 2010 Mercedes GLK350 gets better gas mileage than the ML350 -- how much better?

The 2WD GLK gets 16 city/22 highway, compared to the 2WD ML at 15/20. With a curb weight that is 670 pounds lighter than the Mercedes ML350, this seems about right, though it isn't that much better. Consider too that an ML320 BlueTec diesel actually gets 18/24. While the 3.5-liter is the only available engine in the GLK, rumor is that it will receive a 4-cylinder BlueTec engine for 2011 that should significantly boost its fuel economy. We observed roughly 19.8 mpg during our drive with the GLK on a mix of highway and local roads.

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Photo Credit: Mercedes-Benz