97diesel and 230/8 are both correct in their desc. of fuel delivery/sales practices -though most people just do not realize what goes on. The marketing people from he various companies are selling the name, and the credit card. They are not selling their "brand" of fuel. So, you really never know what it is that you are buying when it comes to gasoline. Even rhe most "honest" of station owners will, occasionally, buy a known lesser-grade of fuel and sell it at the most markup that he can get. The station owners are not the ones making money on fuel in the last 15 years that I have seen the business. The profit goes to the oil jobbers, brand name holder, and the inflated taxes.