Bulk sales are not too different though.
http://www.eia.gov/dnav/pet/hist/LeafHandler.ashx?n=PET&s=A103B00001&f=M
I'm not sure people realize how many different steps there are between drilling a well and filling a gas tank.
Almost every step has been disintermediated - many refiners never own the gasoline they refine: they are processing it for the owner.
Imports and exports of gasoline have to be accounted for, as well as contract refining where the refiner doesn’t own it and thus does not sell it.