30 psi front and back.
it has to say on the tire it should say something like MAX tire pressure 32(PSI) on most passenger cars thats the tire pressure but just to be sure check your tire
For 2 passenger it is 30 psi, with 4 it is 32 psi.
Try to measure the tire pressure on a cold(!) tire and it should be 2 bar for 16' and 17' standard tires.
7 Gallons of oil is used to make one standard car tire
Check the drivers door. There should be a name plate there with the standard tire size for the vehicle.
The standard tire size is 225/60R16.
You should take them to a disposal centre
They should have come standard with 75-series 14" tires
The standard road bike tire size is typically 700c.
The tire marking tells you how much pressure the tire can safely take, and the info on the jamb tell you what the the vehicle should need. The jamb value should be lower than the max on the tire, use that.
The standard mountain bike tire size is typically 27.5 inches in diameter.
Front and rear should be 36 psi as standard (i.e. pressures should be adjusted to suit riding conditions)