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Sorry, why do you think that?

More complete combustion would result in more CO2, H2O, and energy. The by products from incomplete combustion are the ones we want to limit - CO, C, various N and S compounds etc.



Not always. Nitrogen oxides are due to higher temps which is more efficient. In order to meet emissions standards, you often take a hit in efficiency (or at least drive-ability).


Makes a lot of sense, thanks.


The more efficient the combustion, the hotter it is, and the more NOx is formed. Nothing to do with incomplete combustion. Nitrogen doesn't combust.


Makes sense - it's not incomplete combustion but rather atmospheric contamination that allows for NOx products, and the amount of those is dependent on heat of combustion. Thanks!


There's a not insignificant amount of nitrogen in the fuel itself, as well.




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