Question: how much energy does it take to produce a barrel of oil?
Answer: There are 42 gallons (approximately 159 liters) in one barrel of oil. The energy contained in a barrel of oil is approximately 5.8 million British thermal units (MBtus) or 1,700 kilowatt-hours (kWh) of energy. This is an approximate measure because different grades of oil have slightly different energy equivalents.