Last week I installed a new toilet. The old one - an early 1.6 gallon per flush (GPF) model - just was not doing the job. Holding a plunger with one hand while flushing with the other and hoping for the best is just not dignified.
In researching for a replacement I looked for a model that both did the job and saved water. This Toto model (Aquia II Dual Flush) does both.
Now every time I pee and use the 0.9 GPF button 0.7 gallons of water is saved. A big relief for me and a small one for the environment!