Gas price conundrum: Why do prices go up more than they fall?

I have a question for anyone who might know the answer. My question is: Why is it that gas stations drop their prices a penny or two at a time, but raise them anywhere from a nickel to a dime overnight? Does anyone know the answer?

Geraldine Rowland

Bradenton

This story was originally published October 9, 2015 at 5:57 PM with the headline "Gas price conundrum: Why do prices go up more than they fall? ."