My fill pressure for CNG is lower than my scuba tanks, so I am 100% sure a tank 
that would physically be a 60 cubic foot scuba tank is not holding more than 60 
cubic feet of gas. You can figure it out for sure here: 
http://www.divebuddy.com/calculator/tankvolume.aspx
Btw - with 2$ refills, I felt fine topping off to 2000 PSI instead of trying to 
cram the last bit in there.

Joe
Coquina

-----Original Message-----
From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Steve Thomas 
via CnC-List
Sent: Tuesday, January 02, 2018 1:22 PM
To: cnc-list@cnc-list.com
Cc: Steve Thomas <sthom...@bellnet.ca>
Subject: Re: Stus-List CNG tank refill adaptors ABYC

Not that simple. 
You also need to know the compressed gas pressure, and apply the Charles and 
Boyle ideal gas laws to figure out an approximation. The rated volumes are for 
the amount of gas the cylinder contains at the nominal fill pressure, when 
expanded to standard temperature and pressure. (basically sea level and room 
temperature)

Steve

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