Well, here is the first measurement on a brand, if anyone wants to add more brands. I measured one strut using my 4 post lift as a press with a scale under it.
1" compressed = 96 lb
4" compressed = 105 lb
6" combressed = 108 lb
I did not put the Mighty-Lift on my car yet. I still have the Detomaso sold by many on my car, below is a link to the one from Wilkenson. I would be real interested in the pressure of these Detomaso struts.
To continue with this post by adding more pressure measurements of other struts, I just measured the Detomaso 18126A brand from Wilkinson and here are the pressure specs:
1/2 to 1" compressed = 120 lb (this is what it took to make it start to compress).
2" to full compression gradually increased from the 120 to 160 near full compression.