I've heard this a lot, but is this really true? Gas is highly regulated in the U.S. and supposedly a Mom & Pop gas station's gas is just as good as Shell or Chevron..(because they are inspected yearly by the local county's Weights and Measurements department) But the price difference can be quite large, e.g., 15%+ higher sometimes. Also I'm curious how Costco gas is so cheap? Anyway so who is eating up this difference in price? Shell is making quite a bit off gas then? or is the owner of that particular gas station taking the profit?