Emissions controls have no effect at all on CO2 emissions. They don't alter the fundamental stoichiometry of a pure octane combustion: 2C8H18 + 2502 -> 16CO2 +

Emissions controls have no effect at all on CO2 emissions. They don't alter the fundamental stoichiometry of a pure octane combustion: 2C8H18 + 2502 -> 16CO2 + 18H2O So yes, burning a liter of octane (6 moles) will use ~1600 liters of oxygen and emit ~1000 liters of carbon dioxide, or a little over two kilograms. In pure carbon terms, it produces (drumroll) the exact same amount as the input: 49 moles at 12 g/mol or 590 grams.