I've been over 120mph as well. There isn't a governor, it's drag limited. From the acceleration rate above 120mph, I would think the top speed under ideal conditions would be in the low 130 range. I don't think our Vibes are the most aerodynamic especially with the roof rack.
'03 Vibe GT monotone silver/black interior, 17 inch wheels, 6-disc changer, power packageMods: AEM intake, TRD springs, A-spec Strut Bar'01 Corvette Coupe silver/black interior, six-speed, Z51, a few mods, 12.29 at 117.3mph in 1/4 mile on street tires.