Quote:
Originally Posted by Hersbird
I don't believe a leaner burn mixture is ever activated in any modern car because of NOx standards of today, at least in the USA. Volkswagen was basically doing this with their diesel scandal.
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The same cheating device could be fitted to gassers too. But anyway, if a fully-compliant engine could detect NOx levels, that would eventually enable it to go leaner on favorable environmental conditions such as higher relative air humidity in the air. Though I'm not sure how a higher-grade gasoline would interfere with NOx since it might require to take more latent heat of vaporization (thus enabling a smaller amount to be used).