Why does the same gas station have the pumps click off when you pre-pay at different amounts of $?

Question

I've noticed the same gas stations will click the nozzle off or slow it down to where it only pumps a trickle till you hit your prepay amount. I.E. you pre-pay $10 on thursday and pump. pump slows down at $9.75 till it hits $10. Same pump friday slows down at $9.65. What factors does the machine account for to slow or stop the gas?

Answer 1

Probably the price per gallon has changed. It is most likely based on volume remaining to be pumped to determine when to slow down.