Does it seem like the Ryobi really generates 200 ft-lbs? I have a Dewalt corded model, it's supposed to generate something in that range, but won't loosen a lug night tightened to 65 ft-lbs. Of course, it is an older model, so there likely have been improvements.
I think the advantage of higher pressure is that it "stores more air" so a given CFM at lower pressure can be sustained longer. The difference between the 33 gal 165 psi compressor linked earlier and my older 120 psi compressor is quite noticeable.
Many, if not most, air tools are rated for 90psi maximum... so a 120 psi compressor is sufficient. Lately the trend is to higher PSI - like 150 or 175 psi... but not so many CFMs which I find rather pointless.
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