AOA calculator answers: number of refills in a 45 minute tank

Preface: I am testing the water before jumping full-goose-bozo into the deep end of pcp craziness. i.e. NEWBIE ALERT!

I'm a new pcp owner with an avenger. My next purchase is going to be an air source. The 2 choices I'm weighing are a sub $300 air compressor and a pre owned scba tank to be filled (gratis) at fire station. I bought a Vevor 4500psi hand-pump from Amazon. It was difficult to achieve the 3500psi fill I managed... and impossible (for me) to better. Now, the pump is malfunctioning: Silicone oil applied as prescribed. Time to move on.

BIG QUESTION: How many refills can I get from a topped off 45 minute 4500 PSI tank?
My Avengers' air reservoir is 180cc's. The 45 minute tank I'm considering is 66 cubic feet or 28316.8 cc's; I (google) think.
The Avengers' regulator looses enthusiasm as it falls below 2000 psi and after 70 rounds from 3500psi.

Thanks for humoring me
 
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Don't let the tank fill calculator spook you. Keep in mind that it is only going to show you Full fills.
It's rare that I ever do a 'full' fill. I like to store my rifle at the reg pressure so I fill based on how many shots I think I'm going to take.
Any air in your reservoir over what your reg is set is shootable air.
So if I'm only going to shoot 1 mag, I only fill enough for that.
To each their own, but don't think, well I'm only getting 2 fills according to that calculator. Yes you will get around two full fills but then a ton more shots off of partial fills.