Costco Gas Station at 7311 North Melvina Avenue, Niles, Illinois.

It was really crowded during the visit(Saturday 2-3pm) i think it's normal. Every aisle has 4 pomp which is 2 of them right side 2 of them left side. You are feeling you will wait an hour. But it's not gonna take too much time. I have waited around 10 minutes to get my turn. Price is absolutely better than close any another location. Just don't forget they don't accept MasterCard in gas station and in the store which is why it's hard to understand. So my point is 5✅