Tanks full or not, the fact that the front of the car weights much more so it "dives" even with someone driving it and fuel in the tanks (so pushing the balance point to the rear) really shows how close to the front the balance point is...
According to the Experience of a couple of colleagues here, the weight is 2/3 to the Front 1/3 to the rear, so the balance point is more or less 1/3 close to the Front wheels and 2/3 away from the rear one.
This said, you better never tow your M3W on a trailer with the M3W looking backwards! Or as the video shows.... you can be really scared!
