I don't think the numbers are of much use. Leaking seals skew the results too much to give reliable information. There is an actual blowby measurement tool. Never seen one myself.
I propose a 30 gal garbage bag test. Put the breather tube in a 30 gallon garbage bag while holding it sealed tightly around the tube with your hands or duct tape. Time the number of seconds it takes to fill the bag. I think this test, which doesn't rely on high pressures would give better comparative results.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13