Well, Kman, your mermory is perhaps sharper than mine! I feel oddly honored that you should remember my comments from several years ago.
What I remember happened on my Weber DGEV carb, was two kinds of failures. Both that of gasket seepage, and a tear in the accelerator pump diaphragm.
I believe that I had mixed the MPGR with too much Anaprin aspirin crystals. I bought and used the Anaprin since it is pure aspirin, but it's harder to measure a correct amount. It's much easier to just count aspirin tablets, but there remained the idea of impurities with the un-coated aspirin, at least to me.
I do have a digital scale, so I will try to use it to weigh out the right amount of Anaprin when I re-try using MPGR on my '02 Subaru Outback. I still hesitate to re-introduce it in Subie, my '85 Subaru w/ the Weber carb.
I'm glad you helped me remember about MPG Remedy, Kman!