Goodyear Polyglas pressure?

[ORIGLS6]

At least two schools of thought on that subject.
Higher air pressure can give you a more solid pattern across the width of the tire, but it can actually reduce the longitudinal contact area. Lower pressure will most likely show a strong pattern along the outside edges of the tire and lighter pressure near the center, but your longitudinal area and overall contact area will increase.
Just don't go too low on pressure or the car gets a little squirmy at speed.