http://www.snopes.com/politics/gasoline/saudigas.asp
There is a list of those that do not import Arab oil. Citco is on the list but it imports Venezuelan oil.
Here are some large companies that do not import Middle Eastern oil:
Citgo.......................0 barrels
Sunoco.................0 barrels
Conoco.................0 barrels
Sinclair.....................0 barrels
BP/Phillips............0 barrels
Hess........................0 barrels
ARCO.......................0 barrels
We know Citgo imports.
ARCO no longer exists, they were bought by BP. Phillips was never part of BP, they joined with Conoco.
Sunoco imports from: ANGOLA, AZERBAIJAN, CAMEROON, CANADA, NIGERIA, NORWAY and SPAIN.
ConocoPhillips imports from: ANGOLA, CANADA, CHILE, CONGO, ECUADOR, GERMANY, IRAQ, SOUTH KOREA, MEXICO, NIGERIA, RUSSIA, SAUDI ARABIA, UNITED KINGDOM and VENEZUELA
Sinclair only imports from Canada.
Hess imports from: ESTONIA, ARUBA, ALGERIA, RUSSIA, CANADA, SPAIN, TRINIDAD & TOBAGO and VIRGIN ISLANDS.
Source: Energy Information Administration
http://www.eia.gov/pub/oil_gas/petroleum/data_publications/company_level_imports/current/data/import.xls
You get the point?
On top of that, most gasoline station do not only buy gasoline from their own refineries, some of the don't even own refineries. Often a 3rd party will own a pipeline and deliver the product to meet the spec without a guarantee where it came from.
Those types of emails are pure garbage.