I love the size of this vehicle! I spend thousands of miles on the road in my car each year and I feel safe and comfy in this car like SUV. My husband loves to drive it! Its diesel and I have (after 16k) miles been averaging 37-45 miles per gallon. The driver's seat adjusts, and after 16k miles still a bit too firm. The navigation system is not very intuitive and a bit cumbersome to operate...time consuming actually. You must be stopped to enter data which can be a problem if you're already lost in a dicey area! In rural areas where I frequently travel, the turn by turn directions are often non-existent claiming "there is no mapped data available" yet my other car's nav. systems worked just fine. Diesel engine is quite a bit noisier than Toureg Diesel I previously owned. Still struggling with the voice command training working so I can accept calls or enter directions verbally. Overall, this is a nice car and perfect for my needs, very responsive on curvy roads and mountains. Not terribly sure footed in heavy snow. Lots of light, large windshield and sunroof. The rear seats lay down nicely for larger cargo area and perfect for taking dogs along. Nice visibility, but beware of other drivers who don't pay attention to blind spots of those around them as they seem to not see me.
I wanted a vehicle that was small enough to fit in my garage, has strong towing capability for its size, can handle snow and some dirt roads. The GLK250 was at the high end of the price range I was considering, but the build quality reflects the price. Great seats, great engine, great transmission. Minus points: Small cargo area (but if the vehicle was longer it wouldn't fit in my garage). Upright windshield results in a bit of wind noise. Handling feels "heavy" at first but you get used to it and at German-type highway speeds (above 80 mph) it seems tuned just right.
I average 32 to 33 mpg in combined city/highway driving. Diesel engine has great pulling power. Towed a 2500 pound glider trailer from California to Idaho and back and it pulled up mountain grades on Interstate 80 at 65 mph in 7th gear. Also averaged over 30 mpg while towing.
Something to reduce wind noise around the A pillars. Add vortex generators?
NAV system is OK, but not great. Google maps on my phone does a better job.