> Does not the inefficiency also lead to a lessening of cleanliness?
All depends on what we're measuring. In the case of VW, it's the NOx limits that they were cheating on. In order to reduce NOx, you can run a richer air/fuel mixture, which consumes more fuel and is thus inefficient.
If you're instead talking about C02, then you're generally right. Efficiency and cleanliness are aligned.
And my original comment could probably be rephrased as, "fast, clean, efficient, reliable, cheap: pick any three". But that doesn't have zing to it :-)
All depends on what we're measuring. In the case of VW, it's the NOx limits that they were cheating on. In order to reduce NOx, you can run a richer air/fuel mixture, which consumes more fuel and is thus inefficient.
If you're instead talking about C02, then you're generally right. Efficiency and cleanliness are aligned.
And my original comment could probably be rephrased as, "fast, clean, efficient, reliable, cheap: pick any three". But that doesn't have zing to it :-)