I'd not argue. But it is what I said, "mfg info" in your words. And regarding your previous words "Absolutely peak performance", I might have read a bit more into it. My apologies. It doesn't surprise me that your mileage is worse. But I am curious about how 2001 Chevy carb plastic is susceptible to ethanol issues, but my 70s Honda motorcycles aren't. I've owned a couple, and plastics were just started to be used. My '73 CB350F runs just fine, although that shouldn't really surprise me either. Honda saw the writing on the wall regarding lead removal from gas, and used hardened valves from the start('59 for importing into the U.S.). I doubt they could predict ethanol, but maybe they just lucked out.
I just don't see how getting 100k miles out of a fuel pump is so bad though. We don't start looking for excuses when a alternator goes in 100k. Since the advent of computers in cars, power demands have doubled and tripled. My '74 van w/ a 350V8 had a 46 amp alt., and an upgrade was a 60. Today's smaller cars are over 100. And they're about the same size as the old ones, and the tech hasn't improved that much.