On heavy 4 engine jets a split of 15 or so knots is the norm for long haul ops. In fact my mob tend to get mixed up on the very rare occasions when V1 = Vr, often we call "V1" and miss "Vr".
At max TOW, say 412 tons, dry, sea level, no obstacles the figures are around V1 154 Kt, Vr 170 Kt, V2 182Kt.
It figures that the V1 is closer to Vr on twins because they lose 50% thrust where quads lose 25% - one hell of a difference when you are trying to accelerate 200+ tons.
As an interesting aside, we were able to lift more out of NZWN, Wellington, by using RTG 1, a fixed derate, which lowered Vmcg which was the driver on this very short runway.