For those who are curious, the correct tire pressure for all passenger cars is somewhere between the door placard and the sidewall max PSI. Measure pressure cold. What you're looking for is your sweet spot for ride comfort, consistent cornering handling, and tire safety. The sidewall specs (in my wife's case, 94V) assume the tire is running at max PSI (44 lbs in this case). As you lower the tire pressure both the load and speed rating drop. Tire pressures that are too low increase the chance of sidewall failure and in emergency turns I've even seen reports of tires coming off the rims due to excessively low pressure. Low tire pressures also result in lower tread life, but I'm not sure why. I suspect it's due to a larger contact patch with the road. Tire pressures that are too high become rock hard and increase the chance of the tire skipping and thus loosing traction. Auto manufacturers tend to set their door placards too low for consistent handling in corners because they assume Americans don't want to feel the road (many don't).
Due to the way front steer vehicles operate, the wear pattern on tires will tend to wear the edges of the front tires and the centers of the rear tires. This is why a full four wheel rotation pattern is needed. The cross pattern is best because you need to move the rear tires to the front at each rotation and the front tires to the rear. The cross (rear to front or front to rear - pick one and stick with it) ensures the edge wear is consistent from side to side as well. If you wait too long between rotations the wear will become pronounced and won't even out. I recommend going no longer than 5,000 miles as a result. Using 5.000 mile rotations I have actually received longer tread life than the tire manufacturer warrants the tire for.
So experiment with your tires to find the highest pressure that provides the non-emergency ride comfort you want, but don't go above the sidewall PSI when measured cold. Also, ensure you rotate and balance your tires every 5,000 miles (despite Honda saying 7,500 miles). The balancing deals with density variations in the tread that cause the tire's center of balance to not be at the center of spin.