...We have had our GLK250 for almost 5 years (bought New). We like it in many ways, others not so much. It has averaged about 7.2L/100km with mostly highway driving at not much above speed limit. I have never seem mileage below 6.1. We had a problem with the transmission and they installed a new one.
If they wanted to recall my car at market value (like VW did), I would not be unhappy. It's done less than 50k km. These new diesels are not like the old ones (I have one of those too!)
Hi MBGraham, oh! Thanks for your links. I will keep an eye on this. Concerning your GLK, I cab tell you that your story is almost a copy-paste of ours. I ordered my GLK because the colour we choose was a new for the GLK: Brown Dolomite. It took 2 months to received it. We have it since Sept 27th 2013 (its a 2014). We had a noise in the transmission between 50-68km/h. They changed the trans for a new one in crate when we had approx 8,000 km.
Concerning the mileage, on the highway, last year between Montreal and Quebec, after a good one hour of driving, mine is going down to 5.6 a 5.8 L/100.
But before they changed the trans, I wheat down to 5.1 to 5.3 L/100 km. I never been able to repeat this performance of 5.1-5.3 even with the original trans...
But! 5.6 to 5.8 is pretty good! This weeken I am going back to Quebec to celebrate the birthday of my daughter. I will check if my GLK can do again 5.6 - 5.8
I included a picture of the 5.1 before they change the trans.