how many gallons of crude oil does it take to refine into a gallone of gasoline?  does anyone know?  trying to determine underlying (real) price of oil...
The amount of gasoline recovered from unit crude oil volume depends on the type of refinery.  Some refineries get all their gasoline from distilling crude oil (this is called virgin gasoline).  So in this case, the gasoline recovery is proportional to the API gravity.  The lighter the crude, the more the gasoline.  

The gasoline yield is higher if the refinery has "cracking" units.  Almost all large U.S. refineries have crackers, but this is not the case every in the world.

The typial product distribution fo a U.S. refineries is 3% LPG, 10% naphtha, 27% gasoline, 40% middle distillates (diesel, kerosene, jet-fuel), and 20% fuel oils.