I'd be surprised if the efficiency is really different between the PG branded and Pronto versions but who knows.Agreed, but I bought some once from RA and they showed up as Pronto EX’s with “98% at 30 microns” on the box. Iffy on those for that reason since I prefer to order from rockauto.
Interestingly, I have this size in STP XL and CQ extended versions in my stash, and neither box indicates the efficiency. Even the AZ and AA sites no longer state the efficiency ratings. Oh well, either one will certainly work fine for two 5k OCIs on my Odyssey!