That's a larger tire so probably near 150.00 for a cheap one plus mt/bal. A pass car tire is around 100 (new)
40 psi
Correct the tire pressure.
I was looking at the 2003 Ford Escape Owner Guide and it does not show anything about it having a Tire Pressure Monitoring System
P225/70r15
235/70/r16
look at the side of your tire it should tell you the tire pressure most likely anywhere from 35-40
Depends on your wheel size.
There may be three possible causes of fuel pump hum on a Ford Escape. These are the exhaust leak, wheel bearing, or a bad tire.
Ford Escape tire can be stored could be put on top if you need extra storage space but if you need cargo space temporarily then maybe you could find another place for storing them.
P235/70R16 spare is not full size
Xls p225/75r15 xlt p235/70r16
35 to 40 psi depends on weather temperature