RPM should be stable on 1000 for all for optimum fuel consumption.
You can increase RPM to 1200 if you like to, if u r feeling car needs more punch. I have all set on 1K RPM and its running fine.
For tyres, I too have same type specs but of Dunlop. 28 psi is recommended in all fours. In summers you would be needed to maintain pressure at every 5 to 6 days.
An advice if you are in khi: Never visit any pump tyre shop for maintaining air pressures in tyres. They recognize regular ones and will start making small punctures and will tell you next time you visit.