EDIT: The GLK feels amazingly porky. I find myself driving at or under the speed limit because
1. there's almost no increase in noise etc. under 100km/h or so, so I can't really tell naturally without looking at the speedo.
2. just not used to pressing the gas pedal down that far.
3. the fuel consumption meter spends a lot of time over 15. Hopefully it will get better once broken in, but I doubt the car will see more than 10k/yr so its not a massive issue.
Yep, I recall I said that already, It feels way heavier, and unresponsive. To me, the GLK is a very old person's car/truck. BTW, I know it's the parents, not yours. NOT a vehicle if you actually like driving.