can confirm - my apartment came with in-wall dual flush, and has a little leak into the bowl... given the infrequency of use (<1/day per toilet), the leak uses

can confirm - my apartment came with in-wall dual flush, and has a little leak into the bowl... given the infrequency of use (<1/day per toilet), the leak uses far more water than the extra flush, especially vs 1.6 gpf low flow toilets (which btw, work great, e.g. Toto).