[mkiv] Tire pressures

[workmanw at bellsouth.net]

I wanted to get some input from the group on recommended tire pressures as it relates to everyday, spirited driving and then also for HPDE days.  Do +1 or +2 sizes have an impact on the OEM recommended tire pressures (i.e. 18" or 19" wheels vs. 17")?  Are the OEM recommended tire pressures optimum when combined with the Lance specs or is there some other level recommended, higher or lower?  What changes should be made for HPDE days, if any?  Does anyone recommend or see any benefits with switching to nitrogen vs normal compressed air?  Do you have to fully dismount your tires to do this?

Andi and Lance, I know you are out there.  Help me out.  :-)

O.K. I know, a lot of questions are imbedded in this post.  I will apologize in advance.