BG,
Yup, 80psi. But that's just the specification based on load rating. I'm pretty sure your teeth would turn to powder running them at that psi with a vehicle as "light" as the G. Unladen I've been experimenting with pressures between 35 and 45.
Fernando,
I still have a great fondness for my Land Rovers and almost feel like I'm cheating with the new G!
1993 Land Rover NAS Defender 110 #204 (sold '08)
2000 Land Rover Discovery II - heavily modded (sold '07)
1995 Land Rover Defender 90 soft top (sold '02)