My Range Rover requires 36 PSI front and 42 PSI rear. It is the highest PSI (by far) of any car I own.

The higher rear PSI is needed to keep the tail from wagging in high speed maneuvers and overall, I guess the higher PSI also aids in better MPG's

 

I keep my P38s tires at 40 psi (55 psi max Michelins MXV4+)..Ive found any higher makes the ride too harsh, and any softer bulges the sidewalls.

I didnt really think much of it since my AT2s on the Blazer run at 40 psi to keep even tread wear on road...but it is alot higher than the usual 30-35 on most cars.



But Range Rovers arnt most cars

 

I would say that the tire selection is really what will make the difference. The sidewall height, rubber compound and weight of the occupants ans gear all come into play. If you like the ride with those pressures and the wear is good then I do not see why it would be an issue for you.