30 to 32 front & 28 to 30 rear should be about right. I wouldn't be comfortable with anything as low as 25. Radials need a little more air than bias ply tires to work right.
The pressures marked on the sidewalls are a maximum pressure to be used at maximum tire weight loading which is also marked on the sidewall. This is seldom the case on our cars.
If you really want to get into it, put some chalk marks across the treads, drive it, & see if the marks are uniformly rubbed off side to side. Rubbed off on the sides only usually means under inflated & vs.
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