Lots of threads on this. Our gas, as in many places, all comes from the same source. However, the additive pack is what makes the difference. I guarantee you that while he picks up the fuel from the same source as Shell, the additive pack that goes in it is very different, as Shell and others have proprietary packs. The pack going into the mom/pop gas is picked from a menu offered by the distributor, and most independent stores get the minimum, which meets EPA standards. That's fine, but it is not the same as Shell or Esso going into your car. If your car runs fine on it, then no worries. I like the idea of supporting local shops. We've got a Phillips 66 that is both a local family owned store, but has Top Tier gas. Win/win.