Tyre Pressure for 225/40R18 tyres

[technics100]

I’m trying to find out the correct tyre pressure for my tyres. I have found several threads for 235 wide tyres but nothing for 225mm wide. My car is an Avant and I generally drive it with no load or passengers. What PSI do you suggest for the front and back?

tyres are Kumho Estaca tyres 225/40R18 all round.. cheers

 

[1wheelonly]

I have the same size and run 32 all round tech.