What are the differences between toilets with a 1.28 gpf and 1.6 gpf flushing capacity?

Toilets with a 1.28 gpf flushing capacity use less water per flush compared to toilets with a 1.6 gpf capacity. This means that toilets with a 1.28 gpf rating are more water-efficient and can help save on water usage and utility bills over time.