i totally agree with this statement but its only the case with TOYOTA as far as i know, have checked quiet some videos on youtube for top speed of various pakistani version cars. What i saw was:
Civic reborn 1.8= 224km/h (daddy of all )
Altis 1.8= 190km/h
civic 1.6 eagle eye= 205km/h
XLI various models= 180-185km/h
Cultus EFI= 180km/h (quiet surprised to see that )
Liana 1.3= 200 km/h (nightmare keeping in view its road stability)
My own experience in 2010 Altis 1.8 auto cruisetronic edition 190 km/h on M2 and i m quiet sure that it had approx 25% more throttle space from getting floored.
have heard from various autophiles that toyota has this restriction.
in the end would say, keep the road safety measures as first priority and then check the results, keep us all posted.