Are republican's hiding millions of barrels per day of light oil refineries somewhere?  The US refining complex depends on heavy oil being imported.  They are only producing new barrels of light oil with shale that no one wants unless it's blended with heavy/medium oil.

Gasoline prices will skyrocket in the USA if they jack up the priced of the medium/heavy supplies.  The BAT remains just a theory of politicians that don't understand how businesses and industry work.