BS, the tire pressure will rise as you increase the load, and the 30 PSI is also partially maintained by the tire itself. Its a combination of things not just the internal tire pressure. When there is no load , where does the pressure of 30 psi come from. Bogus argument. Yes as you increase tire pressure the adhesion patch will change , and at most people go from 35 psi - the usual recommendation to maybe 44 psi - the usual max on the sidewall, but the size of the contact patch makes a minor decrease and most will never be able notice the adhesion change, its so small. Where is the on the road data that backs up this argument?