Tires: thank you, load index, psi

Question
Dear sir,
  thank you for your immediate answer. The XL tyres should have 5-6 psi more,ihave been told.Is that right? At 29 psi i feel them to be underinflated.
         Thank you
        TSOUMAS Nikolaos

Answer
Nikolaos,

No, that is not correct.  They are thinking XL tires of the same load index as the originals - and that is not true in your case.  What is true is that even though they are Extra Load, at lower pressures they act like Standard Load (SL) tires - 91 Load Index.