I've searched through the various tire pressure threads and while we now all agree on the tire inflation pressure specs for the S60 (19" wheels), S85/P85 (19" and 21" wheels), I can't find the answer to this. For a custom staggered configuration of 245/40-20" (front) and 275/35-20" (rear) which I've just implemented--following others here--what would your recommended tire inflation pressures be? Should we interpolate between the S85/P85 21" (42psi) and the P85+ staggered 21" specs (?? psi front/?? psi rear)? Note this setup is 20" wheels but wider in rear than P85+. (Pics pending).