Originally Posted by Person
There is no reason not to have a HPA tank full. Keep it as full as you can. Won't hurt it one bit.
The tanks lifespan decreases as you bring it from max pressure to minimum pressure.. just the same way a spring wears out not by sitting in a compressed state but by going from compressed to uncompressed. Your tank will live all 15 years of its total life span with zero issues if you leave it at 4500 PSI that entire time. Won't matter.
Good information right here! Thank you!