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98% at 20 microns is what the Premium Guard that's made for Federated Auto says....
That is a good rating. I've not seen a Premium Guard 'labeled' filter as such publish an 'ISO' standard efficiency rating for their filters. The sometimes compared here to PG EX, the AZ STP XL with China coo, locally as new stock comes in all previous ISO efficiency information eliminated from the boxes. The 96% rating on the website for the topic standard PG, as so often noted for other filters, means little to nothing without a micron level.
Based on appearance alone, the PG dissection anecdotes show it to be a decently made filter.