Dual flush toilets usually use 3 and 6 liters of water depending on which way you push the flush handle - 3 liters for a little job and 6 liters for a major event.
Single low-flush toilets use either 4.5 liters or 6 liters.
If the toilet works each time on one flush, they use roughly half the water of a standard toilet. You would then use half as much a month on the toilet. They do not always flush completely on the first flush and the toilet is only a part of the water bill.
3 liters
In a modern toilet you use 13 litres per flush.
It takes 1 bucket of water when we flush.
You use anywhere from 1 cup of water to 5 cups of water to flush the toilet. This is per time you flush the toilet.
Compared to a 30 year old toilet? An amazing amount (I just installed two such toilets, replacing 30-year-old models). These are dual flush, and in the low flush mode - perfectly adequate for 70% of flushes - they use 1.3 gallons. The old toilets used almost 4 gallons per flush. A saving of 2.7 gallons per flush, times (how many??) flushes per day, times 365: You are easily talking thousands of gallons a year.
I believe it's 3 gallons
5 gallons
1.6 GPF.
100 Galen
There is about four to five gallons wasted if you flush a toilet but I don't believe that it makes a difference if the handle is loose or not. Unless, the toilet is leaking from the handle or somewhere else.
Generally, modern toilets are required to be low flow, which is 1.6 gallons (6L) per flush. Older toilets were 3 gpf (11L). Modern toilets vary in the amount of water required to flush them, from 6L to 3L. Some have a dual flush system allowing solids (faeces) to be flushed with a full volume flush, say of 6 or 4.5L, and liquids (urine) to be flushed with a smaller volume flush of about 3L. It is not possible to flush properly a toilet with less water than that with which it was designed to be flushed. Low volume flush toilets have been designed to work efficiently with a smaller volume of water.