First thing first, the Toyota is mine older brother one, he did not modify his car at all, coz by his not a car lover/person. For his personally reason he hate car mod fan, me.
For my waja, I'm travel at 195km/h at 5 gear(manual), my rpm should be a round 5000~5300rpm. I remember it very well coz every gear change(1~5), I rev it to the max of 6500rpm, just before the rpm red-line.
FYI, I start 1st gear, rev till 5000rpm then change to 2nd gear.
Then rev till 6000rpm & change to 3rd.
3rd rev till 6500rpm change to 4th, same as 4th to 5th.
Full throttle on 5th till 195km/h, then the bouch back.
Just to remain it's not perfect every time I did the above, some time touching red-line & some time before 6500rpm. Coz in certain road condition, like going up hill, blocking by others vihicle, bumby road, I might change gear earlier or stay in a gear for longer.
Lastly, my mod on the waja, Mobile 1 full syn oil, Pivot Volt Stablelizer+grounding cable, Denso Iridium Power spark plug, magnet on my fuel line(fuel saver), STP injector cleaner every 5000km. I think these items give me a little extra power(HP&trouqe) to make it to 195km/h. Others mod like HID but I don't thing it'll help much on engine power.