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Originally Posted by fp115
How much of this is actually used by cars?
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All of it.
This is just our usage of gasoline ( 400 million daily ) and diesel fuel ( 140 million daily ) which have almost no other use than to power our vehicles.
Here's the break down of what we get out of a gallon of oil. 42 gal of oil produce...
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One barrel of crude oil, when refined, produces about 20 gallons of finished motor gasoline, and 7 gallons of diesel, as well as other petroleum products. Most of the petroleum products are used to produce energy. For instance, many people across the United States use propane to heat their homes and fuel their cars. Other products made from petroleum include: ink, crayons, bubble gum, dishwashing liquids, deodorant, eyeglasses, records, tires, ammonia, and heart valves.
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http://www.eia.doe.gov/kids/energyfa...l.html#Howused
~20 gal of gasoline
~ 7 gal of diesel fuel
the rest is jet fuel, heating oil and a variety of other minor uses for the products noted above.