The result of your conversion between miles/gallon(US) and exajoule appears here
To convert between Miles/gallon(US) and Exajoule you have to do the following:
First divide 5 / 1.0e+18 = 0.
Then multiply the amount of Miles/gallon(US) you want to convert to Exajoule, use the chart below to guide you.
Symbol: m/G
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Symbol: EJ
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