"Keystone XL is an export pipeline. The Port Arthur, Texas, refiners at the end of its route are focused on expanding exports to Europe, and Latin America. Much of the fuel refined from the pipeline’s heavy crude oil will never reach U.S. drivers’ tanks.
Valero, the key customer for crude oil from Keystone XL, has explicitly detailed an export strategy to its investors. Because Valero’s Port Arthur refinery is in a Foreign Trade Zone, the company can carry out its strategy tax-free"
The purpose of the Keystone pipeline is to attach the isolated island of oil in the central US to the global market where OPEC prices holds sway. The Keystone pipeline is really just a giant straw that will suck wealth out of US consumers and will cost many more jobs than it will create.