Any new bowl since 1992 has been a 1.6 gallon or less bowl.
The 1.28 gallon II series from TOTO have been working very well compared to all the other bowls that you can choose from.
The quality control is very good, and performance too. You can't go wrong with that. At the moment, I'm using the Ultramax II, the Vespin II and the Drake II.
I also have an SG Ultramax from 2006 with 1.6 gallons. They're all pretty much the same.





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