That must be something standard Toyota does at the factory because mine were all at 46 psi too. I was surprised it wasn't adjusted at the dealership, though I did take delivery pretty much from the truck that delivered it to the dealership. Only way to get one around here is to search the dealers every day to see what is available and then beat everyone else to showroom.When I picked up my car the pressure in all four tires was 46 psi so I adjusted them to the proper pressure. Today I learned that I should have also initialized the tire pressure warning system (TPWS). The system operates based on the pressure level at which it was initialized. Since it apparently was initialized at 46 psi, it will not function properly until I initiallize it at the lower pressure.