You'll find the reason the VXR won't do 90 in thrid is cos it has a close ratio box. Theory being that you stay in each gear for less time but keep the revs in the powerband and onto the next gear before you redline, hence needing a six speed box to get the best from it.
Flat out speed in each gear is not really a good test of a cars performance imo, as it depend so much on gear ratios and final drive ratios.