and just to give a rough idea of the top gear on my two bikes, the 95 g.i. has me spinning out at about 50kph or a bit more (at what cadence I have no idea, pretty fast though)
while the other bike with 700 wheels and a 50/12 at 111.5 g.i. spins out at about 70kph (again, no idea of cadence, but pretty much max, whatever that is for me)
to put things in perspective, all the times that I have gone faster than 70k, it had nothing to do with the gearing, ie the bikes were not geared to go anywhere near the speeds, so it was simply by the bike being able to get a good head of steam on its own and letting it run due to the steepness of the hills, good road surface conditions and favorable winds.
As has been written numerous times before, it is very rare to be able to pedal at more than 40kph for more than a brief amount of time (or at least where I live) so hence why the oft touted 100 g.i. is still a fairly reasonable figure to use as a benchmark.