I managed to get about 29.7 mpg's out of my car when I drove 155 miles at 60 or less mph's (steady speed/cruise control) My dad has hit 30.4mpg's doing the same. At 80mph I get about 23.7mpg. Its all in the speed and how long you want to take to get somewhere. Personally I'll take the extra speed/less mpg's, I'd go nuts if I kept it under 60 all the time.  Thats essentially the key though, go slower and you'll get some real good mileage results.
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'15 GLK250 Bluetec 118k - mine - (OC-123,800)
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'13 ML350 Bluetec - 95k - dad's (OC-98k)
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