Ok, here are the results:
After 357 miles mostly with half a can of B-12 in the tank, she has used about 3/4 quart according to the dipstick.
Lately, with the cold weather, I've been running 87 octane with the boost turned down a half turn (about a 10 lb max). She actually calls for 87, but with the hybrid replacement turbo I replaced the bad original with, she can make more boost. So when I want to run a little higher boost (11 lbs), I use priemium and turn up the manual boost controller a little. I mention that due to the look of those plugs, not being sure why they look so white and powdery this time I checked them.
Compression test results before and after...
Before soak:
Dry (cold too) CYL 1 (150) CYL 2 (149) CYL 3 (133) CYL 4 (155)
Wet (cold too) CYL 1 (172) CYL 2 (180) CYL 3 (170) CYL 4 (180)
After soak:
Dry (room temp) CYL 1 (150) CYL 2 (149) CYL 3 (140) CYL 4 (158)
Wet (room temp) CYL 1 (205) CYL 2 (220) CYL 3 (199) CYL 4 (212)
I don't know what to make of it all. Seems like the dry did not differ much. But the wet is considerably better. I probably caused some uneven results as well, not clearly reading the ounce measure on my oil syringe. Cylinder 2 got a half ounce more than the others and my first wet measure was actually 240, which I eventually threw out after I figured out my inequity. Here is what the spark plugs look like. They seem noticeably whiter than they did previously.
So anyone know what to make of all this?
While I have the plugs out and the intake tube off, I think I will pull the valve cover and check the seal of the baffle covers that are notorious for causing too much oil to enter the PCV system, which could be happening, but I did this all a few years ago, so I doubt it.