Actually, the original Dunlops on my 2004 HCH were rated 51PSI max cold pressure rating.
At about 20,000 miles my wife scraped a curb real hard ... leaving deep scrapes in the alloy rim and creating a quarter size flap in the rear passenger tire side wall.
I drove another 60,000 miles, and replaced all for at 80,000 miles. (Worn almost to the wear bars) All tires wore evenly.
They were ran 51PSI for the life of the tires.

Honda suggests 32PSI x 4 which I regard as more of a sales tool, to make the ride rather soft, at the sake of efficiency. The difference in my own experience 32 vs 51 have been around 7MPG. My Honda dealer sets them up at 51PSI, on my request.
All my vehicles have always had max sidewall pressure with no problem what so ever. Our Grand Caravan gains around 5MPG with max pressure.

Regarding poor gas mileage:

Consider this analogy:
If one buys a good sense, energy efficient HOME, but then chooses to set their AC to maximum while running space heaters (For more comfort in the "cold" spots", leaves hot water faucets running for convenience, and burns five 2,000 watt lights outside so they can feel secure at night.
The owner feels the need for extra comfort, convenience and safety.
Deep down he knows that he could save, but since he considers it "normal", continues the wasteful habits.

Now imagine he complains about his energy bill.
After all, it's a "Good sense" home with extra insulation and paid extra $$$ for efficient applicances.

It just doesn't make sense.

Somehow this idea always gets lost regarding transportation.
Almost anyone in almost any vehicle can enjoy savings, if they'd only take the time to learn reasonable fuel efficiency habits.

Good efficiency vs poor efficiency seem to be amplified in hybrid cars and how one drives them.

Just like a good sense energy home.
I don't know if this analogy rings true with anyone here- just thought I'd toss it out.

-Steve

Efficient drivers do it better.
1003 miles a tank personal record. 74MPG calculated. HCH1 CVT