To compensate, overinflate it by a few pounds when you add air and it should be OK for several months.
This is from a trackie, so I'm particularly in tune with and anal about tire pressures. To the extent that I can tell you the exact pressure in any tire I own off the top of my head and I'll be exactly on the money every time.
Read with that in mind.
If you add a couple of extra pounds to a tire, make sure the other tire on the same end of the car has the same pressure. And if the car is AWD (like any Subaru) make sure ALL of the tires have the same pressure.
Not only does this make the handling consistent when turning both directions, it's easier on limited-slip setups. A couple pounds difference in tire pressure can change the outside diameter just enough that the limited-slip clutches are slipping even in a straight line. Or one or both of the tires is. Something has to give when there are diameter (and therefore, rpm) differences.
Personally, I tend to keep family car tires inflated 3-4 lbs above car manufacturer recommendations (they're usually biased towards softness to smooth out the ride -- the Firestone/Explorer scenario) and on ones that only I drive, I use nearly or right at the max the tire will take.
In other words, I try to bias the family car tires a bit toward cornering stability and fuel economy without compromising ride softness too much and on my own cars I throw softness out the window and am concerned only with the pressures that'll permit the most lateral g's or, in the truck and trailer's case, maximum load capacity.
