More than I wanted to know about gasoline:
https://www.sheetz.com/subpages/faqs.jsp#q06 Where does your gas supply come from? Sheetz, Inc. is not in the business of buying or refining crude oil from any country. Furthermore, we do not import gasoline but instead buy it on a domestic basis. Therefore, we do not know or control where the crude oil or gasoline comes from. We buy gasoline from refineries located on the U.S. East and Gulf coast and other trading companies who are in the business of purchasing and refining crude oil. The U.S. needs to import about 60% of its crude oil requirements and 10% of its gasoline needs. Currently, the leading supplier of crude oil to the U.S. is Canada, followed by Saudi Arabia, Venezuela, Mexico and the United Kingdom. However, because crude oil is transported to the U.S. from so many places and immediately "mixed" in tanks and petroleum pipelines for transportation to the refineries, it's impossible to determine exactly "where" the crude oil came from. Likewise, in most areas of the U.S. gasoline from different refiners is mixed together for transportation by a common pipeline network. Additionally, a gallon of gasoline may be traded several times before reaching its final destination, further complicating tracking a gallon's origin.