So long as the tester states terrain and track conditions, (and the Russians did indicate same), that is good enough for amateur discussions.Really? Oh my please pardon my ignorance. I certainly am not aware of any device that is able to identify the terrain, track conditions or the car's drag coefficient! Maybe you could point us in the right direction?
Aero is irrelevant in this particular case as we are all discussing the same vehicle, so variances wouldn't be significant.
However, I'll tell you what IS significant.
At 125 MPH
1450 KG is equivalent to 485 HP, which one would hardly consider amazing
1640 KG (my car) it would be equivalent to 555 HP, which one would have to consider entirely extraordinary .
I suspect the truth is somewhere in between; however we shall never know without the actual vehicle mass, shall we?