My experience with tire pressures is very similar to Hasard above, since 2010 when I got a gen2 Insight. I've watched tire wear closely and its always been even across the tread. However for each car, I've spent an afternoon testing handling characteristics to find the best cold tire pressures, for me. The maximum pressure on the tire sidewall is a cold tire number. I use my own pressure gauge and electric air pump ( available at auto parts store for around $50).
The best pressure for me is the highest pressure that gives me great control while hard cornering, and also allowing for straight line tracking at 70 mph. (With too much air at high speed, the car will drift right or left, requiring correction; in order to travel in a straight line, due to slipping off a high spot in the center of the tread.) With my past two cars the sweet spot has worked out to be 3 to 4.5 psi above recommended.
Like Hasard the roads are very smooth where I drive. It has always been my habit to look for and avoid bumps wherever possible, and I don't mind slowing for a bumpy patch. Were I to drive in NYC, I'd under-inflate cause there's no avoiding them. Unlike Hasard I'd lower the rear tire pressure the two pounds recommended difference between the front and rear. That's because like my 2002 Saturn SL the '19 Insight has 60%+ weight on the front axle. A little less air in the back, then in the front, makes for a more evenly balanced car, in the nose up / down direction. It also helps prevent the back end from wanting to rise up, and off to the side during hard cornering. (The Vehicle Sability Assist (VSA) helps prevent this, but why push the system?)