What is the correct air pressure on toyota Mr2 Spider the tire size on ther rear is 215/45 R16

By operating the tire pressure warning reset switch, the tire pressure warning ECU can be set to issue a warning at an inflation pressure that corresponds to the standard pressure of tires .Therefore, you must set the warning threshold to the proper value in order to comply with the local regulations .Operate the tire pressure warning reset switch only after the inflation pressures of all tires have been adjusted on the vehicle.To initialize the system, press and hold the tire pres- sure warning reset switch for 3 seconds or longer with the ignition switch in the ON position. When the system receives the
initialization signal, the warning light blinks 3 times (1 second on, 1 second off). During initialization, the tire pressure warning valve and transmitter measures the inflation pres sure of the tire, and registers the signals that are transmitted into the tire pressure warning ECU at a frequency of once per minute. The initialization process is completed when signals from all the tires have been received. It takes a few minutes .

Tire size Inflation Front Inflation Rear
P 195/65 R15 89S 30 psi 30 psi
195/65 R15 91H

P 205 /55 R16 89H 32 32 psi
P 215/45 R17 87W
205/55 R16 91V

Front Tire pressure 30 psi.
Rear Tire pressure 28 psi.

First of all, don't exceed the maximum pressure that is marked on the tire.
Most cars have the tire size and tire pressure listed on a tag on the inside of the front door or the door jam. Usually the driver's side.
If you can't find the "official" tire pressure on the door or the owner's manual, you are pretty safe using between 30 and 35psi. I keep my 2002 Escape at 35psi.

there should be a sticker on the driver's door well which tells you what the pressure should be for the front and the rear.
I believe your car has sensors so try to find a digital tire gauge.
I bought one just for vehicles with tire pressure sensors.

Standard size is 215/70 R16. There is an option for 235/70 R16 that was also available.

30 POUNDS PER SQUARE INCH,.

There is a sticker inside your drivers door that lists the stock tire size. This is always the best bet. On line is a web sight from tirerack.com that has explanations of tire sizes, tread ratings and on....

there should be a tag either in the door jamb or the glove box, to show manufacturers recommended tire pressure for you vehicle, also tire size. it should be noted that changing tire pressure can affect fuel mileage and tire wear. I have tires the same size as yours and I run mine at 32 psi

Here's a good tire calculator and it gives you the speedo changes etc.

Tire calculator

You should have the same size tires in the front and back. By having 2 different sizes, you are changing the gear ratios between the front diff. and rear diff. You could wipe out the t-case especially if it is full time 4wd.