From what I've read, most folks keep their GY EMTs between 28 and 32 psi. The maximum pressure is a figure for 'not to exceed' and is rarely the optimum pressure. So, most folks don't inflate their tires that much, and those that do often report early center tread wear. Another group of folks who inflate their GY EMTs above 36 psi are the AutoCross crowd. The reason that they inflate them so high is to increase the sidewall stiffness for the hard cornering of AutoCross. This hard sidewall stiffness has the side effect of creating a harder ride, where the potholes and railroad tracks feel more jarring. So, for daily driving, most folks find that the inflation range of 28 to 32 psi (cold) works well. The manual suggests 30 psi.
Just as a side note, under-inflated GY EMTs will wear prematurely on the shoulders, over-inflated will wear prematurely on the tire's center. If you want to achieve even wear you might want to try this; warm up the tire to operating temperature (rule of thumb, about 4 psi over cold), chalk a line across the width of the tire, drive a few hundred yards and check the chalk line. If the chalk is warn from the shoulders, add some air, if it's warn from the center, remove some air. Keep doing this until the chalk disappears evenly.
As for the quite ride. Some manufatures add a center rib to help quite the tire. By over-inflating the tire, the tire rides higher on the center rib and produces less shoulder noise. The side effects are early center wear, sub-optimal road contact, and a harsher ride.
Other ways to reduce road noise is to add sound proofing to your car, such as Dynamat or replace your GY runflats with another brand. My favorites are GoodYear F1 GS-D3, Michilen Pilot Sport AVS, Bridgestone Pole Position 3, and Yokohamas. I've read reports on all of the above brands that mention reduced road noise. The Michilens and Yokohamas are run-flat tires, the GoodYear F1 GS-D3 and Bridgestones are not.
