Graph# 9
Actual $/barrel vs ETP
Data from: EIA
blue curve, exponential equation derived from ETP model 
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 ETP (Total Production Energy) is the total energy required to extract, process and distribute a gallon of petroleum. It is the total energy required to produce petroleum that controls its price. Since the energy content of a unit of petroleum is fixed for any particular fraction the amount of energy remaining for use by the end consumer is controlled by ETP. Graph# 9 shows the correlation between historical WTI prices as reported by the EIA, and output from the ETP model.