Trying to figure out what tire pressure to run in my recently purchased '75 coupe. The decal on the door says 20 psi front and rear which seems quite low to me. I'm running 245/60/15 B.F Goodrich T/A's vs the GR70-15 listed on the door. 255 would be closer in diameter to the old G70 size but the 245's aren't too far off. The previous owner of the car said he ran 32 psi in them. I found this to be too harsh and rather darty on the highway. I've reduced them to 30 psi and the car still wanders a bit sometimes if the surface is less than ideal. I'm wondering if I should go lower still? What are you guys running your tires at?