I just purchased a set of Dunlop SP Sport Maxx GT Summer tires, it's always summer here, Front 285x35/21 & Rear 325x30/21, cost an arm & leg, problem is I have been advised of three different tire pressures. One on the door pillar, 32psi, one from Dunlop 35psi and one BMW 33psi. She is a 2008 4.8i SAV, anyone any tips, thank you