Tire pressure is like ch
ain lube in that people have very clear opinions, yet there's no real consensus about what's ideal.
Here's someplace to start. Take it with a grain of salt, and use it only as a starting place,then adjust according to your needs.
There's also a long and
good discussion on the same subject in the 50+ forum.
The keys are as follows,
More pressure usually mean lower rolling resistance, but can increase rolling resistance on bumpy roads.
After a certain point the reductions in rolling resistance as pressure rises taper off, and become marginal, so high pressure is good, but highest pressure isn't best.
Increased pressure reduces traction, and makes for a harsher ride,
Given the above, optimal pressure is a matter of balance, and the goal is usually to find the highest pressure that allows good traction, handling and comfort.