Finding correct PSI

I just got new Sailun Terramax HLT OWL 265/70R17 115T tires for my 2021 4 runner. However i noticed I’m getting pretty bad mileage now so I’m curious what psi i should have the tires set to. Have them set to 32 right now which is the recommended psi but I think that’s a little low for these type of tires. Any suggestions?