Here's my 2 cents:

I am convinced that hard acceleration and hard braking have the most effect on tire life.

I run 36/39 psi. I replaced my tires at 17,400 because they were 6 years old and Bridgestone had a sale. They were not to the wear bars yet.

I tried 40 up front for a couple of miles. It was like riding on a rock! I would not give up comfort for thousands and thousands of miles just to get another 10% or more out of a tire. If that is even true. Clearly the lower tire pressure did not wear my tires out faster.