I have noticed on several youtube videos(carwow, AutotopNL) with the M550i that the accelerationtime from 0 to 62mph (100km/h) seems hard to get down to the official time of 3.8 seconds. It seems capable of 4.0 seconds. But on the other hand the M5 Competition seems to be faster to 62 mph than the official time and can even get under 3 seconds. I don't know why its like that. But it seems like the M550i is very fast between 62-124 mph in comparison with for example the Alpina B5 and the RS6 which are slower when going threw the Autotopnl measurements. Have they made the launch more softly than in the M5 or is the gear ratio more optimised for high speed autobahn?
I'm waiting for my car to arrive so can't tell you my own experience yet.
AutotopNL data
https://docs.google.com/spreadsheets...9VQ/edit#gid=0