Best tire pressure for 69 dart with P245 60R14

Dana67Dart said
I saw something once about putting some black paint or the like on a tire and driving the car slowly over some white paper. Basically at a given tire pressure you get a given pattern. Adjust the pressure up or down till you get the most uniform pattern.

The logic seems sound but i dont know if it works
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Yes done that before because I suspected my rear tires 32 psi were too much once the tire band was not touching the ground as the front were on 205 70 R14 I need to put like 26 psi on rear to get a larger footprint.... that's why I am concerned about uneven wearing on 245 60 R14 on 7" wide rims...