My point is that this discrepancy has, in the real world, proved to be a huge public health problem.  And we are not talking about mileage.  We&#x27;re talking about NOx that produces O3.<p>See also nearby: <a href="https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=10364933" rel="nofollow">https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=10364933</a>