I am going to check the tires more often... but checking them all the time will let air out! Today there was no change from yesterday, except the "low" one lost 0.5 and is now at 40.5.

Extra pressure means at least 1.5 MPG better.
In all my years, I have never seen a tire wear out from the center. The edges always wear out first... due to under-inflation... by just a pound or two under the "reccommended" pressure.

Softer Tires = Softer, more comfortable ride.
Harder Tires = Hasher ride, but better fuel economy, and longer life of the tire.

So the "recommended" pressure of 35 is a "middle ground". A good compromise of ride and fuel economy. You can safely trade one for the other. I try not to go past 44-45 psi, but went higher for experimental reasons. I'll also keep the front softer for snow and ice season.

-John