Let it fly based on a mental calculation of the thickness and quality of the paper. Also on a rough guesstimate of the flushing power available on tap. //content.invisioncic.com/y282845/emoticons/fyi.gif.9f1f679348da7204ce960cfc74bca8e0.gif
just decide it based on the poop. If its a runny shit, then you dont need too much. But if its really thick shit.... you might need more, dont want a rogue finger slippin through the tp into a forbidden area lol.