If what the Tech Line guy told you in the chat session is true, then something must have changred lately. Or maybe he's actually giving innacurate info - ??.
For example, the Endurance hasn't been out very long, and when it showed up on Fram's website it showed the same efficiency specs as it shows now , which is 99+% at 20μ and greater based on 3 specified model numbers. Why would they list it as that if it wasn't?
Also, when the non wire-backed Ultra came out, there was an email from Fram posted here showing the efficiency was actually slightly better below 20μ on a specific filter model number. So who knows for sure what's accurate or not.
Too bad Motorking isn't still the Fram Rep, as he could get accurate info from the right people.