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If we're talking about Standard unleaded petrol thats high in octance C8H18, then the combustion is meant to be complete and produce only CO2 at roughtly 59g/MJ of energy and H20 (water) as biproducts. However, NO (Nitrogen Oxide) is produced so is CO (Carbon Monoxide) which is a noxious gas causing death when inhaled in great proportion and other gases like sulphur.

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Q: What are the percentages for each gas roughley given off by petrol when burnt?
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