How many gallons of Crude oil does it take to produce 1 gallon of gasoline?

The question can not be answered that easy.
Crude oil contains little gasoline, so for 1 gallon gasoline you may need many gallons of crude.
Therefore crude oil is processed in a chemical way to break up into lighter part, including gasoline. The process used controls the percentage of end products produced.
If more parrafin or kerosine is required, less gasoline is produced.
So there is no specific single reply possible here, though a good target would be around 10%.
;)