I tried 35 psi at first like most of us did and then went down to 30 because someone said they wore out the middle of a car tire from over inflating it. Just for kicks I then went on down to 28 psi and liked it so much that I figured if it got any better, I wouldn't be able to stand it. So 28 it is for me. I don't adjust up either for luggage or passenger. I got just under 14K on my first Pirelli Eufori and that was with a bunch of burnouts. For reference, I only got 10K on the Dunlop E-3, which in my opinion, ought to be outlawed for sale to the public. It is like riding on snot when you ride in the rain with one of those rim savers. Never will there be another Dunlop mc tire on the back of my bike. Ever. I like the way the car tire sounds when you do a burnout and it just goes straight, doesn't slew sideways like a mc tire does. Just do it, you won't go back, I don't think.