Does costco give discount off of posted fuel price.

When you buy groceries at Safeway you get discounts at their pumps. Most often 10 cents is the discount. Right across the street is a Circle K where the gas is usually at least that much less a gallon...yet you will have lines at Safeway and short or no lines at Circle K. And, of course, you are paying much more for groceries than at most grocery stores. Go figure. You can get a much bigger discount by accumulating points but then you are spending much more on groceries. Go figure.