It's threads like these that make me recognize that a significant percentage of the "plumbers" out there can't hold a candle to Terry and HJ. A preponderance, even?
The comments people reported as being made by their "plumbers" make handi-hacks sound like rocket scientists. Why not just hire a witch doctor to come look at your plumbing? It will probably be cheaper, and certainly equally-valuable.
Toto makes about 250,000 toilets per year just in Georgia. Most statistics I have seen indicate that 8-9 million toilets are sold in the US every year. It has been 19 years since the 1.6gpf mandate went into effect. As a rough number, let's say that over 19 years, 170 million low-flow toilets have been sold.
Does anyone really think that an extra gallon or so of water per flush is going to make the difference between a smoothly-flowing drain and "peanut butter" clogging the pipe? Should we all have bought stock in Roto-Rooter when the low-flow mandate went into effect? Have the drain-cleaning companies seen a disproportionate surge of business that they are secretly relishing? I can imagine Mr. Rooter sitting there rubbing his hands together like the Simpson's Mr. Burns, saying "God bless those low-flows. Now all I see in pipes is peanut butter!! Hahahahahahaha!!!" I don't think that's happening.
I'm thinkin' someone is pouring bacon grease down the drain. Or salad oil, or other oils and food scraps. The many pictures I have seen on my friend Ranger Sewer's web site of peanut-buttery clogs is attributed there to grease. Not low-flows.