You can't really compare a "really old toilet" to anything made since 1992.We bought the Dartmouth to replace a really old toilet
Nothing uses more than 1.6 gallons anymore.
The amount of water in the old bowls left no chance of streaking.
For some weird reason, the bowls do get better with use.
Does anyone know why?
If you do double flush once in a while, it's still quite a savings over a five gallon bowl.
If you double flushed once in five times, it would be 9.6 gallons
Five flushes with a five gallon bowl would be 25 gallons.
You would only be using 38.4% of the water you had previously used.