&gt; I thought it was common knowledge the lab tests are a joke<p>it was common knowledge for a long time that the lab tests were not the same as real world driving. But we thought that,  even though the lab tests were better, there was some meaningful relationship.<p>As it turns out, they are wildly divergent in a lot of cases. And the repercussions are ongoing. Long-term, this might turn out to a turning point in the history of internal-combustion engines.