cruising RPM?

[ToyMG]

I am putting a 1uzfe in my toyota pick up. I am at the point were I'm going to order my gear sets. I would like to know aprox. what rpm a Ls 400 cruises at 100kph (60MPH)

thanks

 

[fugly]

Not LS400 but my car has 3.7 to 1 gears, 225/60/15 tyres(approx 25.5 inchs tall), 1UZ crown gearbox & it does 2400rpm at 100klms in over drive.