I have 2,000 km on mine. Yes, it drones if you drive in 6th gear under 2,500rpm. The intensity seems to vary with the weather i.e., with air density and humidity levels. But, not withstanding the drone, I don't like driving the car under 2,500 rpm, so I don't use 6th gear unless I driving over 70mph. My daily drive is city/highway. My mileage so far is 9.1km/l (about 21 mpg). The same route the year before in a 135 was 25mpg, no drone, using 6th gear. Have said that, very happy and not looking back.