Have you considered sales taxes, property taxes (on the oil company and on the gasoline station), tolls, income taxes (on the gasoline station and the oil company) and federal and state excise taxes?

Keep in mind that I did not list taxes on transportation companies (with the exception of tolls).

Edit: This also does not consider transportation costs, marketing expenses and the <5 cent per gallon profits gasoline stations make to afford a living, all of which are passed on to you at the pump.