3 liters
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.
In a modern toilet you use 13 litres per flush.
It takes 1 bucket of water when we flush.
100 Galen
I believe it's 3 gallons
5 gallons
1.6 GPF.
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.
5 gallons
5 billion gallons per year
Toilets do not function on suction, they flush by using gravity to empty the water from the tank into the bowl, thereby causing the S-trap built into the toilet bowl to siphon. The only way to improve the flush is to cause it to flush with more water (which sometimes helps, sometimes doesn't), or buy a siphon-jet or other power assisted toilet. An older toilet may be to plugged up with mineral deposits to improve the flush much, the amount of deposit depends on what's in your water, how often you clean the toilet, and other factors beyond your control.