It takes about 2.1 gallons of crude oil to produce one gallon of gasoline.
It takes about 2.14 gallons of crude oil to produce one gallon of gasoline.
Each gallon of gasoline requires about 2.14 gallons of crude oil.
Crude oil is a natural resource, so you don't really make it. It takes hundreds of millions of years to create fossil fuel, if that's what your looking for.
Not an exact answer, but a good explanation of the process involved. http://www.technewsworld.com/story/34919.html?wlc=1226588097