Difference+between+GASOLINE+and+PETROLEUM

From what I understand:

PETROLEUM (CRUDE OIL) is what you get when you dig the oil reserves on the Earth. It contains hydrocarbons of various lengths. (Source: http://en.wikipedia.org/wiki/Petroleum) POWER STATIONS can use raw petroleum to produce energy. (Source: http://www.darvill.clara.net/altenerg/fossil.htm)

GASOLINE is refined petroleum. (Source: http://en.wikipedia.org/wiki/File:Crude_Oil_Distillation.png) It is used in CARS.

So I suppose we can analyze the cost/benefits of biofuel and petroleum in POWER STATIONS Or we can analyze the cost/benefits of ethanol/biodiesel and gasoline in CARS

How car engines work (http://auto.howstuffworks.com/engine1.htm) (http://en.wikipedia.org/wiki/Four_stroke_engine)