Early low-flow toilets were really poor. Modern ones clog less than ever. I have a 1.2 gallon-per-flush toilet now (Champion 4) and it's never once clogged even

Early low-flow toilets were really poor. Modern ones clog less than ever. I have a 1.2 gallon-per-flush toilet now (Champion 4) and it's never once clogged even under trying conditions. It's just a design problem to work around. (Yes, the Prius interior isn't well finished for its price, but they managed to make it roomy inside and small outside even under aerodynamic constraints.)