Hi guys i just drove my 4 month old ML63 on a 1000km 11 hour trip averaging a bout 95km/h and a peak speed of about 140km/hand it seemed fine. Now that i am at my destination and driving it regular suburbia the throtle reponse seems to be a bit lacklustre - particularly getting from 40km/h upto about 80 km/h. Does the eingine "get used" to driving at that higher speed for so many kilometres and have to remap for lower sppeds. I took it to a dealer and they did a short engine diagnostic test and the computer did not reveal any problems and the mechanics put the latest sofware upgrade into the engine but it still seems the same. Maybe i am inaginingit after driving at comparatively higher speeds for such a distance. By the way the car had about 6000kms on it prior to the journey. would an engine diagnostic test identify ny problems with the gear box?

The Automatic gearbox learns your driving manners.
Do the sneaky ECU reset. You will find it under search.

https://mbworld.org/forums/w211-amg/148019-holy-crap-you-guys-sneaky-ecu-reset-works.html

Or teach it to be aggresive. I find that more fun than the ECU reset.

Plus add a Sprint Booster! That'll give you the throttle response you're looking for.