I did pull vacuum on the system. 10 in hg, as was specified on the duracool website. (I did this with a hand pump meant for brake bleeding and vac testing. Can you tell I want cold air in my car???????) Then I added 3 of the small cans through the low pressure port. After running the system on LO while stationary, it went right down to 48F according to the cabin temp air sensors. After the car sat like that idling for 20 min, the temp was 52F. ( was filling a sprayer during that time). Then I took the car out on the highway, and at 70 mph, the core's temps were registering 39-40F. Now, we'll see how long the system works like that.
FYI, the pressure of the refrigerant was just over 60 psi, while the guage empty was 15. Seems the pressure requirements are much less with this product to get the same temp drop.....
Will keep updated....

__________________
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'95 S320 LWB
'87 300SDL
'04 E500 wagon 4matic