I've been dealing with this problem since I bought my car in May, and the similarities are very similar between the consumption experienced by some Saturn owners as it is by some 8th gen Corolla owners because the cause is the same and it has nothing to do with the valves and everything to do with documented piston ring defects in both.
ARX, at that level of consumption, is like putting a band-aid on bleeding stump. It isn't going to work. The piston rings (the PISTON RINGS not the VALVES) are beyond the "stuck" phase and severely worn or damaged.
I did move up to 89 Octane in my Toyota awhile back, and saw benefits - though not in oil consumption. I also tried 91, but, oddly enough, it didn't do as well on 91 as it did on 89 or even 87. I still use 89, combined with a UCL. I use other things as well, but mine was a borderline case and recent trends indicate it hadn't crossed the point of no return.
A move up in octane may help in some ways, as it did for me, but it will not reduce consumption. At 1 quart every 100 miles, to reduce consumption there are two options:
1. Rebuild the engine;
2. Replace the engine.
Nothing else is going to produce much effect. And if you spend some time surfing the many Saturn threads on this issue, you will see the same sentiment echoed over, and over, and over again.
BTW, replacing the PCV valve and inspecting the rest of the system was the first thing I did. It had no effect on oil consumption either. And mine, at 1 quart every 1,200 miles, is a borderline case that is not the total write off (as far as this issue goes) that a burner consuming 1 quart every 100 miles is. At that level the rings are toast and nothing in a bottle, nor in the PCV system, nor from a fuel pump, is going to do anything to change that.
Edit: and someone needs to read up a little more about what he's talking about before suggesting that a replacement PCV and higher octane gas is going to have a magical effect on consumption at the level of 1 quart every 100 miles. Wish thinking at its best, and poorly informed at that.
-Spyder