My old CRC chemical handbook has it that a US petroleum barrel is exactly 42 gallons.
Crude oil gets changed into petroleum gas, gasoline, oils, tar, and asphalt.
The total volume of the non-gaseous products will be not much different than the crude
What percentage do they refine into gasoline? I don't know yet.
Anything from 30-70% wouldn't surprise me.
They have both choices and pressures as to what product to make from crude.
( See http://www.oiltycoon.com/htp/refining.html
A person at http://www.elitetrader.com/vb/showth...threadid=33287
says it's about 2/3.
The other product made from the remaining 1/3 of a barrel gets sold too.
So that would be roughly 28 gallons of gasoline from each barrel of oil.