Ram,
If I remember right, the RPM for Ritz petrol at 100 Km/hr (5th gear) is below 2500. Anyway, I dont think you need to worry much about RPM as long as it is in 5th gear and going at reasonable speeds.The ratios are fixed and the RPM cannot be changed for a given gear for a given speed.
For example, if the manufacturer does not discourage driving at (say) 120 Km/hr speed and the corresponding RPM in 5th gear is (say) 2600, then it has to be at 2600. We cannot change the gear ratios after 5th gear!
Tomy
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