HOW MUCH TIRE PRESSURE?
How much air is the right amount to use? It depends on the application, the vehicle, the size of the tires and how much weight is on the tires. The simple answer is to follow the recommended inflation pressures specified by the vehicle manufacturer. The tire inflation specifications are generally listed in the owner's manual or on a decal in the glove box or door jamb.
For many passenger cars and light trucks, the recommended OE tire pressure may range from 28 up to 34 psi. Recommended pressures for front and rear may also vary, and higher pressures may be recommended for towing or hauling loads.
Keep in mind that recommended inflation pressure are for COLD tires. This means tires that have not been driven on for several hours (ideally overnight). It also means tires that are at a normal outside temperature of about 70 degrees F.
To accurately inflate a tire, you have to compensate for changes in temperature. For every 10 degrees F change in ambient temperature, tire pressure will change a little more than half a pound.
A tire that contains 32 psi of air at 70 degrees F will have a little over 35 psi at 100 degrees F - even if the vehicle has not been driven. Take a quick drive down the freeway and heat up the tires even more, and the pressure may read 38 to 40 psi.
Likewise, when seasons change and temperatures drop, tires lose pressure. They have not lost any air, but the air is not exerting as much pressure as before. The same tire that held 32 psi at 70 degrees F will have only about 28 psi when the thermometer hits 32 degrees F. And when temperatures are in the subzero range, the loss in air pressure will be several pounds more.
Altitude will also affect tire pressure. For every 1,000 feet in elevation above sea level, atmospheric pressure decreases about a half a pound. As a result, tire pressure goes up an equal amount. A tire gauge that reads accurately at sea level will read about 3 psi too high at an elevation of 6,000 feet.
I think for your Honda City 30 psi would be ideal but you must consult the manual...that will tell you the exact manufacturer specification