When you oxidize a hydrocarbon, it gains weight - You are adding oxygen. The specific energy of a hydrocarbon is actually zero until you add oxygen.
HC + O2 -> H2O + CO2 (aka, plantfood)
Burning 6.3 pounds of gasoline produces 20 pounds of carbon dioxide.
Burning 6.3 pounds of gasoline produces 8.3 pounds of water.
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