1.28gal for toilet flushing the most efficient toilets. 1.6gal for normal and it can be worse for older ones. I was on a hike that recommended 1 gallon to comp

1.28gal for toilet flushing the most efficient toilets. 1.6gal for normal and it can be worse for older ones. I was on a hike that recommended 1 gallon to complete it for 5 miles round trip. I’m sure there is a method to the madness of 8 gallons per person that isn’t easy to see. There is a lot of rounding up with the military also.